Malicious PDF — malware analysis report

Static analysis result for SHA-256 006223a786645b4d…

MALICIOUS

PDF

74.2 KB Created: 2021-04-02 20:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9dad71d54ee8c1ada26c8570f8a61e8c SHA-1: 1e78109758f275c253f3b55920adf38d4f83cffd SHA-256: 006223a786645b4d06eb12009984b8196b193baf7ba3bc21f77aa036296f32ba
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru' and disguised as a 'Total gym xls setup video', suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=total+gym+xls+setup+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4504554/normal_6021ea8181383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_5ffd61abc0e3c.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/naguda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5fd03d5e8cb15.pdfIn PDF document text
    • http://gramnews.xyz/wanasupikupj4.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/rojeb.pdfIn PDF document text
    • http://apple-fruit.space/stihl_bg55_leaf_blower_reviews9w9ji.pdfIn PDF document text
    • http://opensol.xyz/jogevirugebukuwozavupojigqqmq8.pdfIn PDF document text
    • http://sfr-espace.best/bollywood_video_song_2018vjk5n.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/675eb97d3f83b.pdfIn PDF document text
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/aece9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zexozavo/57526412528.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/37738415661.pdfIn PDF document text
    • http://fekejuw.atwebpages.com/791297391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61dd53ef-d4d3-428e-8d52-ba409c9a8ad8/53571681307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480c1ff3-add5-4113-bf5f-a0b2c3857f2e/grammaire_progressive_du_franais_niveau_dbutant_download.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/gunikejelejuwesulurekew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a8dd4a-627d-4b53-a06b-35b3d18fb6c2/the_decision_book_mikael_krogerus.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/loxoxudaje.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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 5364 bytes
SHA-256: efb73b0d1dc540fb8b248df25a0344a4c450399c2e8c55b0593b88cd254581aa
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 11672 bytes
SHA-256: cea0ec4015f69f08a0ee1dfb6f44af1afa0965a10848d5c265848cc569c1d9ac

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