Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecba300f6c80d42…

MALICIOUS

PDF

77.0 KB Created: 2021-03-05 10:35:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3c7699b7af4c041879c1aeed15ca31bd SHA-1: 91cd23fa1fcd10a6c73478be47a182c83741bb8a SHA-256: fecba300f6c80d42233ed217da4b2777f5941abdcf8d11e0d05fe88fffcf040f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and is classified as malicious by ML and ClamAV. It contains numerous external URLs pointing to various domains, many of which are hosted on disposable platforms like Weebly, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The document body, though heavily corrupted, contains remnants of what appears to be review-related text, possibly a lure for users to click on the embedded links.

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://nipisod.ru/123?utm_term=sharp+r26slm+microwave+oven+reviews PDF link annotation
    • https://mobonojijokatu.weebly.com/uploads/1/3/4/3/134320628/futev_xelagegab_vipivujozulek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_6011c729a611a.pdfIn PDF document text
    • https://metiwefipit.weebly.com/uploads/1/3/1/4/131406934/kozakisek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fcc9e941dce5.pdfIn PDF document text
    • https://kilexudu.weebly.com/uploads/1/3/5/3/135347894/danopimulovoxog-kiwekaf.pdfIn PDF document text
    • http://summerita.fun/kezilifuwtbrys.pdfIn PDF document text
    • https://varozuwibudod.weebly.com/uploads/1/3/4/3/134327914/1140675.pdfIn PDF document text
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/garekada-desuzan-razutoruti.pdfIn PDF document text
    • http://ver-alex.website/50086443731s4s3y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489979/normal_60026bf4d2e0d.pdfIn PDF document text
    • https://rosafuzumago.weebly.com/uploads/1/3/1/8/131857847/5743773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478438/normal_5fedfb78ba11f.pdfIn PDF document text
    • https://mobasulu.weebly.com/uploads/1/3/0/7/130776822/aa61efa4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_b538de9803e04798913bd47fca970a2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zukogi/jezosobipofuxotazasumo.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_7a420179bfdc4f278e9fa9dcc08db09b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/3995960409.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_760bdd332b83454b902f5466bb638b87.pdf?index=trueIn 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_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 5716 bytes
SHA-256: 883caad620ed7ce0daf9d8006523e51c5deb026486011389929b5074da512449
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10852 bytes
SHA-256: 157c4a0c3eca9e7b1017c1afeef23d41b8446e8b49f557e465d1482c17d20e06

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