Malicious PDF — malware analysis report

Static analysis result for SHA-256 94509dbf6fd38f0c…

MALICIOUS

PDF

86.7 KB Created: 2021-03-03 20:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9719e710aa9cbada64638e128cbb6480 SHA-1: 36988df2f26af602f5960eaf24cc8c9d71074204 SHA-256: 94509dbf6fd38f0c75e9ff09672eaea1313364fba281f892bd21e8ccac81df25
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a redirection mechanism to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host many links. No scripts were extracted, but the overall structure and URL analysis point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=value+investing+from+graham+to+buffett+and+beyond+2nd+edition PDF link annotation
    • https://cdn.sqhk.co/sizafutito/Fgegjb0/dikagun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_6022ffabdb787.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/ahfsE6j/gravity_falls_theme_song_remix.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/hjK5ZUp/playmobil_pogromcy_duchow.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/ae9pmoN/97121138831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5fc8aae8c5df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_6026ea38e4e63.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/jjiaVwy/97084536524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://delifas.epizy.com/fenetex_design_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/shivshahi_volvo_bus_game.pdfIn PDF document text
    • http://ligumawi.epizy.com/carnivores_ice_age_full_game_free.pdfIn PDF document text
    • http://felepav.epizy.com/fukolapuvulalaxinabe.pdfIn PDF document text
    • http://xuletesowugi.epizy.com/87008568083.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_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 5720 bytes
SHA-256: d6656b4bc4c2620f1a735901eb355de37b391e40f94e7815d2787d1bb7d19db7
font_01_sfnt_off0001274f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274F 11284 bytes
SHA-256: edcfc108992796b3ab0649501c67fdcaa1311be9f6f08901a44d03ab05a07d38

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