Malicious PDF — malware analysis report

Static analysis result for SHA-256 de22dbe875d2d7cd…

MALICIOUS

PDF

80.5 KB Created: 2021-03-05 13:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 235030f724d49fad93e3d43798daaa01 SHA-1: 406da7d5edb5308aa73c7919f20a81a5d1f693d2 SHA-256: de22dbe875d2d7cddcb7733114ec3e14745a6f3e4146d636d015ba6eadf2d887
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/award?keyword=how+to+install+aftermarket+steering+wheel+controls PDF link annotation
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/7eaf39c794ee63.pdfIn PDF document text
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/gijiso.pdfIn PDF document text
    • http://gobigs.space/fantasy_cave_d_d_style_rpg_walkthroughy5r3d.pdfIn PDF document text
    • http://trastqort.online/43025450903q9213.pdfIn PDF document text
    • http://devgame.design/7985335052208w9f.pdfIn PDF document text
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/gixef.pdfIn PDF document text
    • http://gordei2d.com/creole_pronunciation_guide8qs4h.pdfIn PDF document text
    • https://jipepusubame.weebly.com/uploads/1/3/4/0/134040653/kuxom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e66a21e-dc30-4535-974a-c1dae5be5825/21176576844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c508207f-ffc3-4a1b-8e66-633e82c060e8/do_extra_credits_count_towards_gpa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d143e399-cde9-42be-a4ed-352d3ec525ba/xemivopufonifuketelupipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ae4a65-8d6f-4edd-8715-5b45becd7747/kewofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b0006f-7c93-4f9a-acb0-b285479817ed/element_tv_has_power_but_will_not_turn_on.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_ec66c46fe1e74186904af944fd1d845d.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_8f81432749bb41fca328f9c691ed7ffb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f52ee5c-e966-42a5-a98e-6728db91dff2/5515787440.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_cadb923baadf4be880bca6117ecb6679.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc05264a-a120-4618-b373-eb957929326d/ruxapasezeneno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be02cdef-8610-4e8c-90e9-a51c47928133/folutijumebukadod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825822e4-5d49-405c-be11-d52864fa4551/tozivakadamajulijarozit.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_a8ffb10ca591462aa4fc88eb82a94911.pdf?index=trueIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_ed71c28e34e24058975a1774d0958356.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_176e2adac2374c6b87917ab1839c1c12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3940d00-f6a0-4dfc-8372-15b5c381bd45/75719334300.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 5412 bytes
SHA-256: 43c2800740008ccf2ddc008d1277063e1d582bfa088b4e26780ff7e4f1114aae
font_01_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 10576 bytes
SHA-256: 38f19731acd99de1a08b01e8de7e98983c297d206677a1430e732d57862da1da

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