Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b03dd66c9d12a9…

MALICIOUS

PDF

84.3 KB Created: 2020-11-18 17:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3c132560ca45a886c5e8cba6c6e2abd1 SHA-1: 93c2a65780f7bc0af155f6b051e17364d13f0a97 SHA-256: 80b03dd66c9d12a918bb0e9ccefb43bf0397a464f5c3592981630b117b48d5b5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a non-standard structure designed to redirect users to multiple external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=boy+scout+popcorn+nutrition+facts PDF link annotation
    • https://jinezosibe.weebly.com/uploads/1/3/4/4/134454760/577cbfd.pdfIn PDF document text
    • https://resudejo.weebly.com/uploads/1/3/4/4/134471902/pelasofarofim-tukufelifadad-bedipejale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f86f8d7dd3a2.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/eaafb29ddf2bb1.pdfIn PDF document text
    • https://xegiwisupanax.weebly.com/uploads/1/3/4/3/134367095/negilulenira.pdfIn PDF document text
    • https://pezebojikunebal.weebly.com/uploads/1/3/4/3/134362674/519b9.pdfIn PDF document text
    • https://delutezebojuk.weebly.com/uploads/1/3/4/3/134353455/7722908.pdfIn PDF document text
    • https://daxedinojadu.weebly.com/uploads/1/3/4/5/134590150/2819949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f8a639bb3ef7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a870f94-d4b3-4366-bc8e-c6dae647cc48/la_gloria_por_el_infierno.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/68194035359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d934dc5-c6f6-416e-958f-81776c6fdddc/xafuziluregigunula.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000112dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112DD 28000 bytes
SHA-256: d82a15d4707362721244677b6658427b45c831aff1b9d6f61cda50426830f14e
font_00_sfnt_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 5128 bytes
SHA-256: 841cf66ebc5fbedd88a991c41790fd0ab85dc2b620ef3eb23e47f6372c31ab39
font_01_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 10552 bytes
SHA-256: a992e0a2ebf346f8d6ae0b641188a7977b379502da044a6238817299d551492c

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