Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a988dc76f3ec66…

MALICIOUS

PDF

69.8 KB Created: 2021-02-14 14:17:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 634f0d488a3522cd65f676bec9356e9d SHA-1: 55ce2201a524069ccdd093c5edff071ad38d4210 SHA-256: 86a988dc76f3ec66ee48793bbdac373b2fd989c5f60b2cf016c9e0fe2f70c73c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=keurig+b30+mini+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497093/normal_600fbeac99511.pdfIn PDF document text
    • https://dubelaxelafef.weebly.com/uploads/1/3/1/1/131164372/fiweraguwekusid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5ffe53bc1a1d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6028b85e5370a.pdfIn PDF document text
    • http://1cats.space/roots_of_complex_numbers_examplestly17.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/lemoval.pdfIn PDF document text
    • https://pagopolekabob.weebly.com/uploads/1/3/4/3/134305888/vunovaxijonokaveno.pdfIn PDF document text
    • http://e-sparks.ru/285937039768ja5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_6021a04d7d957.pdfIn PDF document text
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/30de9451.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawigut.rf.gd/angostura_bitters_drink_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/ser_bachiller_examen.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/wedding_invitation_card_template_online.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/setisololovuxu.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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 5244 bytes
SHA-256: af856caad680de040b68e5bb3767268207e8f8b8639012ecb736feefef46246e
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 10240 bytes
SHA-256: 25a90af1f8fe7dd5189b3560b7a9d0032860379ae988f8297f5e416637c51e91

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