Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c3ac04629ed9e2…

MALICIOUS

PDF

78.5 KB Created: 2021-05-25 10:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 70d558d6b06cfcaee483c549aedadda1 SHA-1: 920bd1d8956831de9181c78d9e588014b9407ffd SHA-256: f1c3ac04629ed9e2fe2e189e06a5638227a2588f0b58098aa77fcb67de394bbf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+describe+rhonchi+lung+sounds In PDF document text
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/mebawoxigidigiji.pdfIn PDF document text
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/4d4b8ee0d20.pdfIn PDF document text
    • https://meletiwupidime.weebly.com/uploads/1/3/5/3/135313264/d5a2c.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/c54d6768-0c27-43b7-aff0-7876970609b5/19755279511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d39d84-9b87-4937-8499-718fd8d6f986/ranukiwumev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca547e0d-bcfb-41da-ae09-bcdc1396b294/96394034100.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/what_is_the_mendels_second_law_of_inheritance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cecbe113-20ef-4bee-b86c-64c9202c030d/how_to_fix_a_maytag_gas_dryer_that_wont_heat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0785a439-f1ba-4ca5-8b05-3f92b0aed81b/core_cal_bridge_csp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573fb7b6-6460-4608-a80b-a68e51121cbf/zifuvopafexonazo.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/zogadipopox.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/kegegakoxemekolu.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/bakijat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e5848b-1840-460c-a575-9a1a81bda3aa/57909624418.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/nmon_rhel_6_rpm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1274ee3c-b1a2-4c83-bcb0-31f1b68d6ee6/24047660886.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/24053181418.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/laxezikubotofagavazezase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fdf679-6ff8-4dea-bacd-6d5857aa46ff/33458116547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4662007f-1d09-4c3b-be62-985ebe59bfe0/samsung_powerfoam_vrt_top_load_washer_manual.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_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 5068 bytes
SHA-256: 66c9893f584dcb0d57bf6b1a8c84da749058e14f4d0ebd9710187f03e7a7bf2d
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 10348 bytes
SHA-256: d4ee4e6728cb85a32a0102dc226a85e8d0a8649bdc34c195f00a1fb0d6dbdced
font_02_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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