Malicious PDF — malware analysis report

Static analysis result for SHA-256 4084fefdb047c3bd…

MALICIOUS

PDF

66.6 KB Created: 2021-01-10 22:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f1c8d85f2ff32a2e86391e1b99c75b92 SHA-1: 78453bdc8818f73e011e47db911fe6231e7051ca SHA-256: 4084fefdb047c3bde2bf6d558824646c8993ba64e33b9ea58631dd3c25af6e1b
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://traffmen.ru/123?utm_term=chs+bell+schedule+2020', is identified as a malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/123?utm_term=chs+bell+schedule+2020 In PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/37025724644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5ff4c2d340263.pdfIn PDF document text
    • https://cdn.sqhk.co/nasonamav/jhTgj9p/truck_accessories_calgary_nw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_5fdbaf287b1fa.pdfIn PDF document text
    • https://site-1174179.mozfiles.com/files/1174179/51439492452.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/qjhpPV9/dhoom_machale_english_version_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/iiIjeAH/pc_games_more_wow_bibel.pdfIn PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/77621596786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5f9dfe3643b27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/tosutefetubemesawok.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/muxovoxilinaz.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/formal_charge_and_resonance_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/autoformation_excel_2007.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5A 4696 bytes
SHA-256: 2462a993cbdd9069bd4d8c7f8b8e747de217e710fc7639bb2c1233e727c0ea01
font_01_sfnt_off0000cc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 10256 bytes
SHA-256: d58f065960f1205e75bf61c6d50751058ca1b78a4e6fe6d782385e5a9a80b4d2
font_02_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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