Malicious PDF — malware analysis report

Static analysis result for SHA-256 6908826b4cc16701…

MALICIOUS

PDF

104.9 KB Created: 2021-05-18 03:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e8f99ef1ccb39300407d0f7c4eaeb0d6 SHA-1: 52750312c9837fa903cea53b687e4dc9fecdf7f1 SHA-256: 6908826b4cc167015cbbb8b5f234d2ccec50b43ed48ca047ec669f887255b185
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure related to removing watermarks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a precursor to a password-protected archive. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/strik?utm_term=how+to+remove+pdf+xchange+watermark PDF link annotation
    • https://nefufepaxesa.weebly.com/uploads/1/3/1/4/131453268/dowusakizonesenuze.pdfIn PDF document text
    • http://xilakivorawavos.22web.org/28179809995.pdfIn PDF document text
    • https://wufopuse.weebly.com/uploads/1/3/5/3/135300065/6771e0b025d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_606895e4087ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459176/normal_6058ec14b7c05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5fdd33905ee37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_600814c4e307c.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/wudibirewuduto/88673723306.pdfIn PDF document text
    • http://salidelukedi.epizy.com/list_of_all_nfl_teams.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/93877859713.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/how_much_is_it_to_fix_a_smart_tv_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/53544637342.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/78972680933.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/vinopirojewinodamaxaruzud.pdfIn PDF document text
    • http://tiwufuwivuvuf.epizy.com/lomajisototoxep.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_off00015b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B83 5604 bytes
SHA-256: 219c6ea0e828cfaef14b4f3a82405eb6b37dd538ba07ae4d0d10623e9587e84c
font_01_sfnt_off00016e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E85 11924 bytes
SHA-256: 44fa3fe9f7eeb058b215b39d4d200568e975aee1ab26d7a5b483513e287c05fa

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