Malicious PDF — malware analysis report

Static analysis result for SHA-256 564082c57e6fa981…

MALICIOUS

PDF

68.5 KB Created: 2021-06-09 04:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d891bed823febd0adc4d7c9461205d2 SHA-1: a7e57981195d59db01df4f4c72978e3cd7d7331b SHA-256: 564082c57e6fa9815330a1e1a7efbe621cdafde84d1c3bc3477fba292e60e552
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/pbw?utm_term=lr+eswari+old+amman+songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383572/normal_6069e0f912ce9.pdfIn PDF document text
    • https://setoximusekaz.weebly.com/uploads/1/3/4/7/134714347/rivorogisej.pdfIn PDF document text
    • https://xamegazu.weebly.com/uploads/1/3/4/4/134440804/8120bc29e619f18.pdfIn PDF document text
    • https://kovepezerolozu.weebly.com/uploads/1/3/1/4/131483153/gakutikatinija-bezoxug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_605df34936692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_60c000cf1d115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_600628f1b33d9.pdfIn PDF document text
    • https://solemadu.weebly.com/uploads/1/3/4/4/134486709/1598331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_60278075156ce.pdfIn PDF document text
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/lajiwawelosofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_60bc94f49af7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_606865718ee10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_6063a185deb52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483836/normal_6057069f43689.pdfIn PDF document text
    • https://wujenorap.weebly.com/uploads/1/3/5/3/135322769/6184681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_5fda5c6253c40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikupuzajix.pbworks.com/f/25912388201.pdfIn PDF document text
    • http://panuduxeruv.pbworks.com/f/44020421239.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/zefekavovosanabajedijite.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144416970/phim_nht_bn_hay_v_tnh_yu_thy_tr.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144421263/hsv_eraser_really_work.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_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 5180 bytes
SHA-256: 6194a6717adcbba317aa5891046c7f06d063e133cc9275d8f34e69b592e80fc2
font_01_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 10188 bytes
SHA-256: a88d42a536a5c99b142fa1d6d7d961e5ff5bb32b9524d891616308da5ed9ef42