Malicious PDF — malware analysis report

Static analysis result for SHA-256 651be78b4bae90ac…

MALICIOUS

PDF

71.1 KB Created: 2020-12-25 02:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ea8fa367bd7801f9ef4ead01c250446c SHA-1: d96c8b6034980ea187929a6736804c1a6bdcbd45 SHA-256: 651be78b4bae90ac8782c54ec979f131acc200a1482884f6e9958493f04c4b62
246 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. It uses brand-impersonation credential phishing. 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 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xevubevisebu.weebly.com/uploads/1/3/4/7/134754503/9900091.pdf.
  • 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://trafficel.ru/strik?utm_term=directv+phone+number+customer+service+pay+bill PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5fc47ec9ebb00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fd6363415a44.pdfIn PDF document text
    • https://xevubevisebu.weebly.com/uploads/1/3/4/7/134754503/9900091.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/borokafob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_5f9c37b240930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_5fae596b55934.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/RDQkfil/85086981052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5fcf9a006586d.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/petumekewadujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_5fbd57d696f2f.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/fia9tJR/english_to_tamil_dictionary_offline_app_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369640/normal_5fde49f8098d0.pdfIn PDF document text
    • https://tapojanez.weebly.com/uploads/1/3/1/3/131398133/6560788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_5fba5e72371f7.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/1fb8e7b4-e35e-463e-970f-8195a36f1917/kixakokexewimokiporazo.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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 5472 bytes
SHA-256: 194a399400d0aac4fb900895d426e717d1272bc0c1c893b3c9800fc99f43a835
font_01_sfnt_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 11172 bytes
SHA-256: c5ddd0f6bce1443c8046caab722073ebecd5f0ac85f288c2128a208f97d279ca

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