Malicious PDF — malware analysis report

Static analysis result for SHA-256 4911e34e36895df0…

MALICIOUS

PDF

73.1 KB Created: 2021-06-09 05:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3c60cf716d81a00e900aa1e1312c3f8b SHA-1: 8ba027d6fc17fac3e9f829d58b93a5fe141c359a SHA-256: 4911e34e36895df0e74d38d138be732b8223a232c1d81ada9ef6a3d41c69f4e8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The presence of external URIs and the overall structure suggest this PDF is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://nipisod.ru/123?utm_term=solubility+curve+worksheet+chemistry+if8766 PDF link annotation
    • https://jofukesor.weebly.com/uploads/1/3/3/9/133999831/lefanuxav.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/rafotibojitim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417405/normal_6003f03cb6f4c.pdfIn PDF document text
    • https://xomafenasaweni.weebly.com/uploads/1/3/4/4/134486242/popiletubif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_5fe7bd3f5198e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_601acd50b3b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_6016a679a9fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_5fd0f2f730683.pdfIn PDF document text
    • https://wejilosadala.weebly.com/uploads/1/3/0/8/130815097/kobunazi.pdfIn PDF document text
    • https://lupoleleki.weebly.com/uploads/1/3/4/5/134516255/8512780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422135/normal_5ffa55c742234.pdfIn PDF document text
    • https://xutevuper.weebly.com/uploads/1/3/0/9/130969179/mobutivosego.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491688/normal_5fe5980637465.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/ded8d840-f854-44a3-a7d6-7465b30dc2e9/al_que_esta_sentado_en_el_trono_y_al_cordero_letra_y_acordes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a4b682-a1b7-4a78-bc95-97af47ce1527/zibibasavuwoped.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/doraemon_nobita_and_the_birth_of_japan_2016_full_movie_in_hindi_youtube.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144427413/41497457766.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/noxoradizudobapaduwew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c19f42-d3ea-4b8c-8d33-4a8777cb15a0/word_problems_using_right_triangle_trig_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7af4e9-541b-4b75-a233-3515cf7ff24d/buderus_logamax_plus_gb142-45_g20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e7c20d9-8087-4d17-8450-1a76e02630c6/xusil.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_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 5900 bytes
SHA-256: 8e390fe742c1f98729a0a94cc417f8c2d8d9e1175f7042e43ab1157a9f2c6e5e
font_01_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 11480 bytes
SHA-256: e9bbfaa37da40ecda9acdf85058fa072ef034f8559804e544888952b810b0a8d

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