Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5f825b7d687950…

MALICIOUS

PDF

71.9 KB Created: 2021-04-27 16:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 27e9792bc71ca59a69118960fb58bae0 SHA-1: 3c4927aa1423b3ed31a763f5fe0b0fcd898c178b SHA-256: 8f5f825b7d687950cc1cd75558c6fd41b44555393aee8049a88f7c1009fa7200
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=free+online+autocad+courses+for+beginners PDF link annotation
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/2388488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_60598b88559c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_60344c2630e85.pdfIn PDF document text
    • https://ginegumogigoxi.weebly.com/uploads/1/3/2/8/132816185/rukulegumevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_605001e59b37e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_60343829d418f.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/behdjgi/62394974210.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/Eijhayk/human_fall_flat_xbox_one_2_player.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/wamusigiji_fomufuseliba_mison_midetumiri.pdfIn PDF document text
    • https://donagifiwududo.weebly.com/uploads/1/3/3/9/133985641/8ef04e7e44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421342/normal_5fed742cb3cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_600f637c14b65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_bbb856d2407a49e69598be39f50bb477.pdf?index=trueIn PDF document text
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_87010be8d7184879af12df7103e90f45.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_8fa1c712575049368e46d4b838e930dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ff9241-0338-43b9-9172-e237f0c12631/how_to_do_cfop_easy.pdfIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_884a080762a644ce9c8caa88d84ca1e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fdd5235-8560-43bd-9105-4d532d8602a6/how_to_make_ethanol_hand_sanitizer_smell_better.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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 5284 bytes
SHA-256: ea91bae6d500364923e56b8cae0a15e0f4c3ed4c7138b4e9d699538fde116b3a
font_01_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10636 bytes
SHA-256: 21b4f9552f531cfff6d6ef7cef5d3636d65b47f3b0d82de269e35e15294a119b

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