Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1cfd99e9b5bf31…

MALICIOUS

PDF

75.7 KB Created: 2021-04-03 09:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3dd20843f661adc3731aa31a0ce99ace SHA-1: 40aff680d9406bb8a48c7427b9d612f535619a68 SHA-256: 4b1cfd99e9b5bf316cdc38889a4cd5ad6123f2d05204f5a2ef55a4fbade9fcf5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=cartoon+love+video+songs+in+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406787/normal_601597046025f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_60596501d5b69.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/hftAgdO/free_fire_hd_wallpaper_for_pc_download.pdfIn PDF document text
    • https://didogetikazem.weebly.com/uploads/1/3/0/7/130776535/nezimivuwubowa.pdfIn PDF document text
    • https://wuvipovuzodex.weebly.com/uploads/1/3/4/8/134846945/2145652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_604eea1b9f758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_605dba1b8f72c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_6050abf81e989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_60639223b3d8e.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/h7seiv4/2nd_grade_online_educational_games.pdfIn PDF document text
    • https://dovenokitumenu.weebly.com/uploads/1/3/1/4/131482991/9786c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6025b8028692d.pdfIn PDF document text
    • https://tofukoluto.weebly.com/uploads/1/3/0/7/130775982/padogosifuwefukuxej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_7b403d894ae14e3584055951ad232520.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_dce81aee24de44bdaa307f1806dc730c.pdf?index=trueIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_4f8b11138ffe4dd491c9c91807dc8453.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a11df20-3c61-43d9-90d6-43cf997c2571/laliku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bdd08fd-4ecf-4091-98a3-e27a97f03e38/kawaii_how_to_draw_really_cute_stuff_amazon.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_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 5108 bytes
SHA-256: 7ed40fb58674036daa225a6f72f5e63eb2617ed6f143a00ef9ab32e21c8a4e9a
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 11092 bytes
SHA-256: 8b0d5b23d22e6bee25f9254048606ba300b0beef37f3c72ddbf1a30b1a235118

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