Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4257ff7556b86d…

MALICIOUS

PDF

74.7 KB Created: 2021-06-12 06:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 40febb1522777b60d8576451b9feee07 SHA-1: 8174c9977552c03d6359c7a7a4c4aa5c96dae032 SHA-256: 5b4257ff7556b86d3234e787fa6eb3fbed396c5ba8e9954fdd747407baeeb1b7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://cructi.ru/pbw?utm_term=rope+hero+old+version. No scripts were extracted from this sample, but the overall structure and URL distribution strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cructi.ru/pbw?utm_term=rope+hero+old+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5ff56e4856976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_60111d96cbe5c.pdfIn PDF document text
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/zewakaxuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_604cdcb95b410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5fed28b38fcb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5ff660c3cc232.pdfIn PDF document text
    • https://fodumalape.weebly.com/uploads/1/3/2/6/132695584/2414002061a363.pdfIn PDF document text
    • https://kojoridenifuzav.weebly.com/uploads/1/3/1/4/131406931/25e399a51ea4ed.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/regixijaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424330/normal_5fcd422cafc55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_600f34d76e927.pdfIn PDF document text
    • https://jowojijap.weebly.com/uploads/1/3/4/0/134042892/robotelizapive_taded_zozigepujosit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466657/normal_5fde66cd365c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujefapufefi.pbworks.com/f/sudden_strike_4_strategy_guide.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/w/file/fetch/144603216/34150172681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36ab312-0883-40d1-85ad-722469400450/wukirilovejarutete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a23d3d1-6b14-460d-8793-e506ed4d6f97/nogogubuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5807ea-1fbd-4cf4-94b8-a075e0f26756/the_revenant_2015_script.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144424077/guia_super_mario_bros_nintendo_ds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd46bfb4-a40d-4e8b-9dbd-57509053f29b/barrons_sat_premium_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56cbbbd-92e8-4c10-81ec-32d346384c8f/how_to_anoint_with_oil_for_healing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be29c9e1-0f86-49f8-862f-e99032e9eeae/59069390608.pdfIn PDF document text
    • http://xewubamefa.pbworks.com/w/file/fetch/144680136/best_couchtuner_alternative.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_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 4904 bytes
SHA-256: cfdc57628be0bcc405361f5cd4dd8ddee2b2f87275b4be4952d5f4600ed0c88f
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 11052 bytes
SHA-256: d848af36f3d90faf02d8bc6e12145c826f26041c26bb566b4b9abe3b6da1eb88

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