Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5168921a3aac53…

MALICIOUS

PDF

67.1 KB Created: 2020-11-28 04:37:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f6c73e0d6e6aac81025dc6b89e464fc6 SHA-1: c3778e373ca37f7e84ec95cde94bdb3244ad4f9d SHA-256: cb5168921a3aac53e65fe57c88556217c297269c66bd2ac115b6f8b7d2466f3c
156 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 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 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.
  • 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://trafftec.ru/strik?utm_term=form+568+2015 PDF link annotation
    • https://janokapaw.weebly.com/uploads/1/3/4/3/134329878/2539459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_5fb756d443125.pdfIn PDF document text
    • https://wimuvolerodam.weebly.com/uploads/1/3/4/7/134747149/juzofurug.pdfIn PDF document text
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/mutuwenawivakejawed.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/tazesadujoniloxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5f9f5e1f67d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5fa74f247444f.pdfIn PDF document text
    • https://gejodaxavusaw.weebly.com/uploads/1/3/4/7/134708791/f480240e8.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/e0b81385-67d9-4f63-b983-5451c3c6eca5/93115606150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32da94f8-1ba7-4053-a01d-07f053452931/16795355123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87919d8c-ab9d-4434-9209-671a68803528/33029267010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b2d67e-bd06-4f4f-bfcb-238c6ebdce82/fesos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a252e18-dcd3-44a2-9bfa-8420ce954326/20701232725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c054d805-1336-4068-85b4-e3657b663396/tier_2_interventions_list.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 5164 bytes
SHA-256: 47bd44cb3dac67692b701c994655e6092e67a3462f6495f34f8b867ddd412734
font_01_sfnt_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 9884 bytes
SHA-256: 505b7e8700efe73f084db837c7ad18df7ad576245af13ccfb1b141f77be79f9b

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