Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c151f5b013fa0ef…

MALICIOUS

PDF

77.8 KB Created: 2021-02-23 19:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d5ff9b162b7ec38646f1d42680159fb1 SHA-1: e7f383ae820e6e396770999c3797b179c97f5656 SHA-256: 8c151f5b013fa0ef02bb1cb77e7662c374bb97c83a0575a238bc16dda9d21291
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=which+are+the+three+major+types+of+dramatic+plot+structure PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380210/normal_5ff3d006a9a7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491725/normal_5fee7146573e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fe99b6eefe38.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/wikakukikekubaposu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418985/normal_5fe293da026fa.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/1151217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_602a0f2580e78.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/kevufanakesadipexaf.pdfIn PDF document text
    • https://cdn.sqhk.co/filovosa/gjVnig5/red_neutralizer_for_hair.pdfIn PDF document text
    • https://jubagidegugidok.weebly.com/uploads/1/3/5/3/135317658/serikejawowoxixan.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/229d8945b8e53e.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/dljeMhg/58731630674.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5fe3a0289be12.pdfIn PDF document text
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/d2076e84d72.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/795350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377706/normal_5ff03e3fef4b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_5fda995289ce1.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/dugibabafod/a4_labels_template_24_per_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/texafagewekomamokesofuda.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/bxactions_pro_apk_2019.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 5588 bytes
SHA-256: 2547d6ebe38aab212fbfbb3e17bbfb1acbad8617561e916e67730bd8e309e943
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 10356 bytes
SHA-256: 5a8d0ee158ed95c2d4aa8a36c7e6741adceb47d60b5c9120046f6989362dc49b
font_02_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 16028 bytes
SHA-256: 13adf508137d8c465935a7a142060f5d940462760dc3fd3f5061e956d2f2222b

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