Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4bd3f950fd3dd0…

MALICIOUS

PDF

72.7 KB Created: 2021-05-07 19:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c6154f78e9c657ec24162d3e4cb7138 SHA-1: 2c839bd73c96839a6b13942b66656f7c2bbbf4df SHA-256: bf4bd3f950fd3dd0b384c9a78bff20da1f0f51ca77b62528dd4ef3d2f406f4f7
186 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=dyson+dc39+head+not+spinning PDF link annotation
    • http://wozilimesiz.mypressonline.com/3059612722.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/4591376986.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/nhfjbji/72976540710.pdfIn PDF document text
    • https://ganunosor.weebly.com/uploads/1/3/0/8/130814229/fudoson-nosaligatanumi-deralekijakugu.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/vemoburome.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/hb6Dggg/motown_greatest_hits.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/ceieThb/ice_cream_shop_for_sale_illinois.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/fccef.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/RYjzcC5/petroleum_engineering_schools_in_new_york.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/egfnjeA/vepadisodititipojode.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/ifjfkfX/fossil_quiz_answer.pdfIn PDF document text
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/busuvodivubul.pdfIn PDF document text
    • https://mazokaru.weebly.com/uploads/1/3/5/3/135303974/8d990dcaec81.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelemusib/qigp8gi/muraweku.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/b3hjhaW/18227213265.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/nomikafu.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/54927084909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telosizaba.onlinewebshop.net/23962617426.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/essential_clinical_anatomy_by_keith_moore.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/pivatolekapajid.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 5628 bytes
SHA-256: 08887ac680f74361f434ace2a839b1cdd403b168da4d7209cfd6172790b96b87
font_01_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 10388 bytes
SHA-256: 6c84a471073e27a4e3db7b06b3456c3b85842da650acb9d14785e60c1d75beb2

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