Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c84fe9564731ed…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 20:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c66b75a9ebabfc81d39b002371cced9f SHA-1: 5a3ffdac90de04da2895e39b1634c22da15db19b SHA-256: a3c84fe9564731edcf61fcb8877217b6b380a5ac18150ce2e942f27eadddbb3c
186 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. 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 0.9997

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://xajibur.ru/wix?keyword=the+ghost+bride+full+movie+123movies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fd2eeed82b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492580/normal_604f8fa43dfcb.pdfIn PDF document text
    • http://vigirorimikana.medianewsonline.com/xajonifinarobuzovoxaragid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_604d46a1863cf.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/is_sacred_cow_offensive.pdfIn PDF document text
    • http://lufexaxoxak.mygamesonline.org/arabic_morphology_and_syntax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_601ef44d4ccaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_603e507531e18.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/basale_stimulation_demenz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_605d9e2085d1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_601b9adb85654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_602b02f2ada43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377647/normal_5fe11423a1890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425929/normal_600308f9c7ab1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459921/normal_6005f6bb93e87.pdfIn PDF document text
    • http://gelufose.scienceontheweb.net/78703929817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_ff4bf113b92e4e61a616ee27e224b0a9.pdf?index=trueIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_101972ded35440b3b608a778ab694412.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_d2648c8b22004e69bace84af04b9832b.pdf?index=trueIn PDF document text
    • http://keregimuw.onlinewebshop.net/bass_guitar_notes_for_beginners.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_ccbb488cf7364c6686c850fb3491a5e7.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_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5608 bytes
SHA-256: 1b36914afa459db3749dad4255fc634f15e0b73905a7e451c2260a85e5a4219e
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 11448 bytes
SHA-256: a4ead3d94c5d7b6af4e8fd42fd7d022c1bbdf049a2a4e43353acebb1c1c9d543

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