Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfdac1aa57fa614…

MALICIOUS

PDF

76.6 KB Created: 2021-01-21 20:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c2d73ee40c5bb1365e111650d263582b SHA-1: 1b6343e0590bfcf0e2f6e36b1611df383fdab2e4 SHA-256: 4cfdac1aa57fa614db59e6a977a0b06f2d0f2ccdf43125e31a24ec69215664f8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a large number of external links, with many pointing to disposable hosting services, indicating a link farm or phishing operation. The presence of 'utm_term' in one of the URLs suggests tracking or redirection for malicious purposes.

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://seumenha.ru/123?utm_term=nc+labor+laws+for+minors PDF link annotation
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/zuvogegakofelukevut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5fe71590d4efb.pdfIn PDF document text
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/mewes-rumetobubiwu-fefaderufeto-lizisegiwaruga.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvasovosew/CVJ2jeG/34363960980.pdfIn PDF document text
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/7da4f1f4c77f28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470391/normal_5fff5a89999ba.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/7507820.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/sisolatev_vegizakoxef_lajome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_5fe900ed3b461.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/nibix.pdfIn PDF document text
    • https://vemosesagegedow.weebly.com/uploads/1/3/4/3/134312783/1944355.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/rabematavizebin.pdfIn PDF document text
    • https://walegizagoz.weebly.com/uploads/1/3/0/7/130775215/labexefuwovew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 5228 bytes
SHA-256: 751f838cc65ef30a7bcf18d3e45e06d180e2818947a4c131c8eb7e1fa4f6b98f
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10176 bytes
SHA-256: b78e09b13a410b9fd23bee4eeddc66c62d9e90c468dd69c5e31a4584bf3d10d8

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