Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ecb0fc837df838…

MALICIOUS

PDF

69.8 KB Created: 2020-11-26 05:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b1e5a5b31788b13b7b6e670dbaea5a4a SHA-1: 146543ee5f852a8fb765d04a0a12ee8ea131d9be SHA-256: 74ecb0fc837df8383cc9632973823b44c1935076d88c71c4a2b6de5102a860bb
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://trafficel.ru/123?utm_term=cruisair+carry+on+5000+manual PDF link annotation
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/6c66d7916.pdfIn PDF document text
    • https://zotujovub.weebly.com/uploads/1/3/4/3/134354671/mugefuvemon-wexuve.pdfIn PDF document text
    • https://zatuduxe.weebly.com/uploads/1/3/4/5/134595584/1493157.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1140105.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/nexofobe_dukan_nonozaguref_jubegesasipofaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5fa5280d21f47.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/jiboserosiwotifosen.pdfIn PDF document text
    • https://loxigiberojawi.weebly.com/uploads/1/3/4/7/134770663/47b7071f6dcf.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/mevop_konolivebazol_dijipig_zuxeviwar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tifuwuw/ukulele_fingerstyle_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C9 5020 bytes
SHA-256: 57d09f0707cd909d08c5f4140f58fe8fac3fb705230599d1a82a0f665fb67a86
font_01_sfnt_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 11420 bytes
SHA-256: 0b464b9c157d6b82ed247d05d98c88a591ccf2592387ce6ac5d50c5c8ef69a3b
font_02_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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