Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa1c43cf6044d76…

MALICIOUS

PDF

76.7 KB Created: 2021-03-13 20:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b2e796ebf4abea16094a80e2cd7f422b SHA-1: 91d342457ea6291e8e2e6124e1837aeab23c738f SHA-256: faa1c43cf6044d76b378087e30dd2267bf4f0ea68d789052e4f42582c050964a
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-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://bologen.ru/123?utm_term=broadsheet+in+instagram PDF link annotation
    • http://sale-siberian-force.online/kifiligen0i484.pdfIn PDF document text
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/vukawutima_gijikexuzip_simiba.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/xadas.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/sefemitofafilejuno.pdfIn PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/a261a2bcdd.pdfIn PDF document text
    • http://triple-doska3.club/catacombs_guided_tour_paris7pe01.pdfIn PDF document text
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/8951708.pdfIn PDF document text
    • http://raisinshub.club/62941725904pcjb2.pdfIn PDF document text
    • https://welaruno.weebly.com/uploads/1/3/5/3/135325412/gowamunobore_jewivujen.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/c29b72b8-e074-44c8-be22-117468a23068/best_cyber_security_courses_online_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdc2da8-049b-48ef-a69d-2e1eea4fe990/painting_kitchen_cabinets_black_before_and_after.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_0f90fee4079943cd9e3768069845f1c2.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_4d39881a28e3446da995d3419cc02db9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cace725b-cf66-46fa-a1d9-7d46c1700a2c/legobotet.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_483fbb5f65c547228146cb7977edab7c.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_61f470da21e24a95a0055a0bcddea15e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c371b3f6-78e5-4cac-acb7-04d39c362fe5/27587064724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07dee6c-b294-4d1f-88f3-a3c31ec32505/flysky_fs_i6_radio_transmitter_mode_2a_2.4ghz_6ch.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_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 5256 bytes
SHA-256: e0aa5a8f8177c6a82d341a1aa0e6cbf29fb2c29e91d505cad84e39d966bd8f09
font_01_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 10904 bytes
SHA-256: 49ab3d8e1d73701bf282a670007f5a19b8438c347855ccc404dd544cf3aa657e

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