Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8c8e996ee3390d…

MALICIOUS

PDF

76.5 KB Created: 2021-06-03 16:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b99fb900abbcda6f88ce5f1eee9e5b11 SHA-1: 68316b80ac177a968ecaa31a0caca12e1c70250d SHA-256: fc8c8e996ee3390d502b0ab897df68c87a04bc9351bcba80487aa98c925854bd
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, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

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://vilenefex.ru/123?utm_term=chrome+os+free PDF link annotation
    • https://ruxibini.weebly.com/uploads/1/3/2/6/132680870/rodefavigis.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/dezijatupewobop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_60392c35e19d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_60250710daf4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_6051482d48d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_6037f4443b274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461523/normal_60379bc696d8b.pdfIn PDF document text
    • https://dogewirezuv.weebly.com/uploads/1/3/4/6/134699505/wefukobawukora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_600a5f4b8a1e6.pdfIn PDF document text
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/1045156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_5fe73e7a1273b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sinorodolu.pbworks.com/w/file/fetch/144445068/degax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99c6ad9-ea3d-4055-8064-dc465172ec74/gimozoveme.pdfIn PDF document text
    • http://namikikis.pbworks.com/w/file/fetch/144516762/masa_molecular_feoh3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfbe6ee1-2d07-4d16-af53-96329525c298/65797942282.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/88525280427.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 4344 bytes
SHA-256: 9a641c61651c97f7fe9f1ae0d720fbc9d98c1e063ba7e03bd13d9edea25f4aa0
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 10740 bytes
SHA-256: a612ec07adcab69180b1c368d372c2e7115f2249371e94f7a72a85f37034d243
font_02_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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