Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae7138b7bde53e4…

MALICIOUS

PDF

76.9 KB Created: 2021-02-21 23:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d5085f2d9b71b1c698ccf5ecf6e08ab8 SHA-1: 7a4085ac7f6664e7d4361e48385a83f4c05ca07e SHA-256: 5ae7138b7bde53e4e435bf0f1b631fae9726975ac58cf80a7a2be1947728bf08
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity, likely designed to redirect users to harmful content or phishing sites.

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 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.
  • 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://leonvi.ru/strik?utm_term=how+to+remove+acne+scars+from+back+naturally PDF link annotation
    • https://cdn.sqhk.co/sejixikerut/ibjaX0F/kotawedibedejeku.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/d0ighjj/6501379981.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/1311cdb3d4c89.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/QOjfgh2/63579764847.pdfIn PDF document text
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/8488869.pdfIn PDF document text
    • https://cdn.sqhk.co/murevexi/hevyTii/breaking_the_life_cycle.pdfIn PDF document text
    • http://agencymedia-ig.com/xiduzukokogipunatodaxagapc51uj.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/n6Xijic/36923974941.pdfIn PDF document text
    • https://cdn.sqhk.co/dojarodawiw/vjiZtge/dizetitile.pdfIn PDF document text
    • https://cdn.sqhk.co/matapolid/gehcOig/5376582496.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/idii65d/chocolate_milkshake_recipe_with_vanilla_ice_cream.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/djeiojh/forza_street_tap_racing_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pezofut/bisection_method_in_c.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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 5448 bytes
SHA-256: d43c4562c06a2b209f6e97c3d4cf935fd552f3fc662a2603c91b1f0451414cd5
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 11048 bytes
SHA-256: 9614201c46180c41f356feb964f1a80bd237c3ec41c1623d95ef36d0518431b0

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