Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04b0b3e2ae1da56…

MALICIOUS

PDF

76.4 KB Created: 2021-02-19 10:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 545ae61e49eac23e8abf050cae8943c6 SHA-1: 931962eede8a9d693566d4f1ed74f2cec059af72 SHA-256: c04b0b3e2ae1da561e250cbc255f206fae9bbf6e428addf533d268e6f5697cc7
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 0.9998

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://baarspo.ru/wix?keyword=ron+white+net+worth PDF link annotation
    • https://cdn.sqhk.co/rapedipular/gjgjAWd/jigegodotijatotus.pdfIn PDF document text
    • http://lady-bug.club/complex_sentences_worksheet_3rd_grade7o1zs.pdfIn PDF document text
    • https://nafutitis.weebly.com/uploads/1/3/6/0/136053715/resimuvebawovej-gunibe.pdfIn PDF document text
    • https://wabiwuwisurukim.weebly.com/uploads/1/3/2/6/132682822/1ac3c8.pdfIn PDF document text
    • http://amandeepsadyora.com/128522850412hkjr.pdfIn PDF document text
    • https://ripabukufekova.weebly.com/uploads/1/3/0/7/130738984/38389e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_5fd6ff6d207d4.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/ahghiia/offroad_outlaws_cheats.pdfIn PDF document text
    • http://cz-nitrof.website/demon_hunter_wow_pvp_guideidf7o.pdfIn PDF document text
    • http://b4shop.icu/unplanned_book_free_downloadpsiwx.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/aDLIjcG/capsule_pharmacy_reviews.pdfIn PDF document text
    • http://feelslike35.com/mudakisexavugoxedubll35.pdfIn PDF document text
    • http://hookup157.site/birthday_images_hdo4n3i.pdfIn PDF document text
    • https://jezasozogederek.weebly.com/uploads/1/3/5/9/135960593/2405814.pdfIn PDF document text
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/nosirutezodid.pdfIn PDF document text
    • https://ropaligezavizaf.weebly.com/uploads/1/3/5/9/135962070/tezebo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 4452 bytes
SHA-256: 4eb97579f1406ec696471c27e3055f59ade84804e7b8e825f5402a29f6deae84
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 10344 bytes
SHA-256: d9b40e858c84052a3d9cab8b90066d80a099b9a0bee2c8d2ababa1be6083a4d5