Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbdbac93de13f76…

MALICIOUS

PDF

70.9 KB Created: 2021-06-13 23:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c85794da02cce63e4f05937857215e50 SHA-1: 1fb94dc6f554a08779b1ac7cf9ae786247ed3de5 SHA-256: 9fbdbac93de13f768d1a52cf360f3329507436e17d8c5cf6bc253205ca6d3e58
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 0.9995

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://philabc.ru/pbw?utm_term=free+skins+account PDF link annotation
    • https://ruwawowek.weebly.com/uploads/1/3/2/7/132712040/3459854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_60214228dc81b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469852/normal_5fca1662ac25c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_6014c315151f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6058be3c16fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_60571611d1b46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369506/normal_6008f306437db.pdfIn PDF document text
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/fenelekupidugefunu.pdfIn PDF document text
    • https://virobejiku.weebly.com/uploads/1/3/5/3/135324848/rudobikakax-sovotodatux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496001/normal_60bf12f255020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_606a266c81fc6.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/637549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_602c30d0c489f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_600e985f92856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471114/normal_5fde76484facc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://metukamef.pbworks.com/w/file/fetch/145126443/create_photo_collage_with_text_online_free.pdfIn PDF document text
    • http://ronejoxerer.pbworks.com/w/file/fetch/145004646/suicide_squad_full_movie_free_download_in_english.pdfIn PDF document text
    • http://mitamugukojo.pbworks.com/w/file/fetch/145017684/navonegasidabuma.pdfIn PDF document text
    • http://detomipipu.pbworks.com/f/55814546925.pdfIn PDF document text
    • http://vogituvu.pbworks.com/f/kenneth_hagin_daily_devotional.pdfIn PDF document text
    • http://wurutaw.pbworks.com/f/how_much_are_1993_marvel_cards_worth.pdfIn PDF document text
    • http://daxulesep.pbworks.com/w/file/fetch/144727530/how_to_charge_my_onn_wireless_earbuds.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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 4780 bytes
SHA-256: e787a4b026d0a2d6f03f5352767a6698e01a448930bae0badb9900ddd2b87e18
font_01_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 10156 bytes
SHA-256: 2396168781e208242431ca7c25ef5dd2e60101e42216544bf85d7fd05c7017f8

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