Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4db57918848ed7d…

MALICIOUS

PDF

70.5 KB Created: 2021-02-08 05:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 133f81255418af78aaa8375e42055be8 SHA-1: 711f4521252f6962264f84a4ce81109cf4e5471e SHA-256: c4db57918848ed7ddd1aba3b5c438277b009098e21b7390e62cec070e92601e4
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'https://seumenha.ru/123?utm_term=what+is+a+pcm+doctor', which is likely part of a phishing or social engineering attempt to trick the user into clicking the link. The document body, though heavily obfuscated, contains text related to the URL, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+is+a+pcm+doctor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384304/normal_60188d460684c.pdfIn PDF document text
    • http://vofovadero.22web.org/85916193437.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414176/normal_5ff87cfab2d23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374710/normal_5fe3a998e92b0.pdfIn PDF document text
    • http://xufunuduxatene.iblogger.org/75816836626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigazimo.epizy.com/cats_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/15680490093.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/29844587331.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/8727021381.pdfIn PDF document text
    • http://xoxitazowakovit.rf.gd/titanium_acoustic_piano_sheet_music.pdfIn PDF document text
    • http://jadupapobixe.epizy.com/tosagometuxafirifajezolu.pdfIn PDF document text
    • http://guzimuj.rf.gd/rascals_movie_mp4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/insuficiencia_cardiaca_congestiva_diagnostico.pdfIn PDF document text
    • http://jilovin.epizy.com/63180601302.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/concentric_reducer_sheet_metal_layout.pdfIn PDF document text
    • http://degudodenotiva.rf.gd/53998763089.pdfIn PDF document text
    • http://gesonumakokobal.rf.gd/cactiez_0._7.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/pawawumafixemupegasunuma.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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 5296 bytes
SHA-256: c4a749cfe99d42a841b03b7b2cfc2d470a70d44738db1bf491ca8f88af936d89
font_01_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 10272 bytes
SHA-256: f7b1d2297671540792f2a541c9eab71fc5e4df1fbc7fdccce0fb0b06b0064f9b

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