Malicious PDF — malware analysis report

Static analysis result for SHA-256 be91f6029d961f69…

MALICIOUS

PDF

66.4 KB Created: 2021-01-18 11:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7e0d844fad6b3895213c26aab579d7e5 SHA-1: bb6c24c4176ae73fb7d2e81f68f00c328f304832 SHA-256: be91f6029d961f69b4d99b9e11c52d7ebc3ca95df97f80c6e5a001eb276cef01
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains an embedded URL pointing to 'seumenha.ru', which is likely part of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct users to open a password-protected archive, a common tactic to bypass gateway security.

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
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/123?utm_term=pps+student+portal PDF link annotation
    • https://site-1175554.mozfiles.com/files/1175554/18580226889.pdfIn PDF document text
    • https://site-1176476.mozfiles.com/files/1176476/fugufevamerudoxe.pdfIn PDF document text
    • https://site-1197190.mozfiles.com/files/1197190/81339865783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fce760980761.pdfIn PDF document text
    • https://cdn.sqhk.co/badimoweba/ihhigif/kurojetokigigoxifukid.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/rorives/xotenikop.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/janidasejaboluli.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/gilolisulekimejeromeneg.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/46152689330.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/88085936096.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/beethoven_sonata_no_15_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/43894083124.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/7286908327.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_off0000c5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 4956 bytes
SHA-256: a3d85aa62ec224bed8ff60b5fe418e89fc04fa111e38fe462505c2ae8391d372
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 11352 bytes
SHA-256: 8490e05c426c24b28511ee07481d3d4fabf914ab3a731348d1c5e9aaa289969a

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