Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e7578b9198cd94…

MALICIOUS

PDF

87.5 KB Created: 2021-03-14 13:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 907376599662bccfd13db73dcc060a6c SHA-1: d0b3df9df0d145242c8aa97e5c68993c78de626e SHA-256: c8e7578b9198cd948c33b7aea898823a894122f64abda9ff955d9472fcf7203e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with heuristics indicating it functions as a link farm and redirects to malicious infrastructure. Notably, one URL points to a known malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=is+mr+fantastic+immortal In PDF document text
    • http://diniguwoweka.iblogger.org/are_old_white_sewing_machines_worth_anything.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/sakimipelivudasujozifup.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/a6bc879d.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/google_account_search_history_delete.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/6dfbc8746940f7.pdfIn PDF document text
    • https://wizamivakujeji.weebly.com/uploads/1/3/4/5/134526499/vudigilabixefetu.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/nibenakuveg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d516bd9c-1b29-480d-b505-ee333335070c/vidokusekixexifawu.pdfIn PDF document text
    • http://zedaziwubisod.rf.gd/19369309393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/318bbfbd-426b-4818-8996-ca2f2577d113/catch_me_if_you_can_musical_bootleg.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_02c5c502ecb04678af763a4feeb42f81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9605a0-11bc-41f1-b9ab-fdcb363b9ce1/xemuloxinewilasesezuz.pdfIn PDF document text
    • http://gojutudur.epizy.com/internet_safety_worksheets_for_middle_school.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_5f0ac9eec35643ef9555be97d0e9203d.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_1a115448e4b84b1c9292dbf2583ffbb8.pdf?index=trueIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_e65d60a13bc34a5cbdb55948620144da.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_fa1e39cf71e74bcba72a221023b10e51.pdf?index=trueIn PDF document text
    • http://revudipepofaten.myartsonline.com/special_relativity_for_dummies.pdfIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_5d874ea528cd456da262c46d92aca9a4.pdf?index=trueIn PDF document text
    • http://vepitejususas.atwebpages.com/37140968966.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_5c925c1728cc4d67be3fcff9d3abac5a.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_b5d198aecfdd436ab701ca6045121bf3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5248c965-3110-403e-85aa-e64bfe39d37d/silence_of_the_lambs_novel_analysis.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_b8100d5135a8455b9fcdbdf146f05c79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca747da6-2a19-4cf6-910e-eae9cfd86ca8/how_to_measure_energy_efficiency.pdfIn PDF document text
    • http://rodigosixe.rf.gd/36054745912.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_3622f86dd8c54ced95e958783cb7f3aa.pdf?index=trueIn PDF document text
    • http://rizibapuzaduxe.epizy.com/define_annotation_in_bioinformatics.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/vulixewilusilano.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 4636 bytes
SHA-256: 28364716f16d21ff574cea3f9d46abd90de493e8f5337066b5b3f36cdd796b5f
font_01_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 10932 bytes
SHA-256: f06e0d9939e53dc30572f37eb3d70dfe1d01207799251a9619c843ec62e2c832
font_02_sfnt_off00014252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14252 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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