Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cef27189ee8b14…

MALICIOUS

PDF

82.8 KB Created: 2020-11-13 20:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e075914f47bdf77fc8c85cb4747aef97 SHA-1: d54823cd08dad5d65cd2fd0cfd6c165fc5d15cc4 SHA-256: 97cef27189ee8b14b2ef02e67a9da8539a81ebb169ae45e9848d4eb5bf01259f
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body is heavily obfuscated, but the presence of a link farm and a direct link to a known malicious redirector suggests an attempt to lure users to malicious sites. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=materia+guide+ff7
    • https://dabituge.weebly.com/uploads/1/3/4/3/134344098/vanekot-luretewupon-navaka-xovutenawuxujo.pdf
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5f9353f1d1bb1.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8704b5ebb7b.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/f47f5.pdf
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/97878.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7269d08d-aaf2-479d-907c-40112d169eed/dusoxos.pdf
    • https://s3.amazonaws.com/lomogas/zupunonojaloba.pdf
    • https://uploads.strikinglycdn.com/files/83762351-e5fa-4652-bcfc-18b7bfe482ae/93055094990.pdf
    • https://s3.amazonaws.com/retisovojor/bach_toccata_and_fugue_in_d_minor.pdf
    • https://s3.amazonaws.com/nefagolom/sql_server_2012_management_studio_express.pdf
    • https://uploads.strikinglycdn.com/files/1912a937-3fe1-4285-aeb9-58b473df8d5a/81427714265.pdf
    • https://uploads.strikinglycdn.com/files/755a1d5c-a1be-445e-99a9-c74f9f4df6af/english_flash_card_pokemon.pdf
    • https://uploads.strikinglycdn.com/files/c90fe76a-5bd6-4a7a-8101-0b689070fd23/venta_personal_definicion.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b6.bin
155a4449244b8b4581fa62ba3c01455a2e4d310e4fa2f7ac0de33926c1eee035		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 5712 bytes
font_01_sfnt_off00010692.bin
f0969dcb59ebfc8f2a858997f226bf52005731e6db74f10c7c6d5d4e61f85db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 4952 bytes
font_02_sfnt_off00011794.bin
3eb82d499e32bacc938b5eb17433ea2f625fe77d0ff4530cf8e76e5d7ad8003f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 11468 bytes

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