Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28681b2ef048988…

MALICIOUS

PDF

71.3 KB Created: 2020-12-18 14:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc1b56dde4c0dd63b0f76e69508f527e SHA-1: d640479eaa4f6b893cc6e9ddee571fd1bb362eb5 SHA-256: b28681b2ef04898863b0de3f59592873b32ed05fd23884f5e1ab4623950bf3d0
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to 'traffmen.ru' and a large number of external PDF links, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were extracted, the embedded URLs are the primary indicators of malicious intent.

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://traffmen.ru/strik?utm_term=dios+no+usa+lapiz+labial+pdf
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/duruvobumun.pdf
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/mowitazawinidor_zeranuzovoziw_tazuzen_zojenalenovisa.pdf
    • https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/4107821.pdf
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/rumajizogiwusane.pdf
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/ad0a46b9144f4.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/wotukomomig-safozepogadala.pdf
    • https://votewisuzub.weebly.com/uploads/1/3/4/6/134605747/e0aa11cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e70d1452f90b7fe56088/t/5fc2551ef81c9a2a0cedc8b7/1606571294464/5e_potion_of_climbing_cost.pdf
    • https://static1.squarespace.com/static/5fc149731c8c741314347862/t/5fc2b763145a8629dc09ebf4/1606596451688/graduated_cylinder_worksheet_answers.pdf
    • https://static1.squarespace.com/static/5fc0d49a16f6d44b07be6b5d/t/5fc749cb0623334b0c5d9f44/1606896075692/29559816840.pdf
    • https://static1.squarespace.com/static/5fcdeb653775b77c105d660d/t/5fced941509e863c681ffa44/1607391555536/sniper_anti_terrorist_shoot_mod_apk.pdf
    • https://static1.squarespace.com/static/5fc0052111f6a4198480c96b/t/5fc751c70623334b0c5e3691/1606898121613/31441778880.pdf
    • https://uploads.strikinglycdn.com/files/dfa29211-b3ab-4a3d-ba83-e4fc2c356bdd/vamurefuwodopupadijutid.pdf
    • https://static1.squarespace.com/static/5fc654e0affbf90a660f952b/t/5fcae3779d29b56e4df6bef7/1607132024766/30831236786.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a1.bin
04df1263ca22b374aed58ff3df81c38cff4105367f54f0cce687e68a6ab56816		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 5128 bytes
font_01_sfnt_off0000e832.bin
b2cf4f44ef86f797076672b62267c6ff7cd399a80a4373882a8fb9eff41f45e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 11508 bytes

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