Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec752338948f7e53…

MALICIOUS

PDF

72.9 KB Created: 2020-12-31 22:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a34371d6bea777f98ae8e462221eaac0 SHA-1: e72deafe8842df19e57abb2012255971d6d5c330 SHA-256: ec752338948f7e53337a3a49d6c31e9b1116d344bbabe63f732cc7724cb54e22
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. ML classification and ClamAV also flagged the file as malicious. Although the document body is heavily obfuscated, the presence of a malicious URL strongly suggests an attempt to redirect the user to a site for phishing or malware delivery, aligning with Spearphishing Attachment tactics. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=gum+wrapper+bracelet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5fe53841a3923.pdfIn PDF document text
    • https://xisilejawot.weebly.com/uploads/1/3/4/0/134016881/1479116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f8eb8c10457b.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegase/ibgfhib/spiral_staircase_dimensions_in_feet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_5fb5a73b8fc0c.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/cZhhGhe/36846063894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5fd7f0cad0b26.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/palikuvexake/counting_quarters_dimes_nickels_and_pennies_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/mobile_network_signal_booster_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1226bf4-64e4-47f6-9fd0-f76f972bf97b/70201614946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd43af09-895d-421f-b99f-6b115c610e61/buy_simple_past_tense.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 5164 bytes
SHA-256: 1a941423ec357282f2145f9ef911891d3572a5ab7fe7554732e34acd95499e46
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 10444 bytes
SHA-256: 33bb4a60eb93f6328dd9eea411bf1a6ff1f8bd698167e552244dc513b27e0a5f

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