Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7c235882eda7a7…

MALICIOUS

PDF

82.7 KB Created: 2020-12-24 23:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b241838f8c8775827f1650f6c2ba4b5 SHA-1: 0d59348191129fd2de29b4fe9b9d335644874189 SHA-256: 3f7c235882eda7a7ef8aaeb37eaa1aed6b507c7d4ef0c98e0a6d27078312bf46
174 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical alert for a malicious redirector link. The ML classifier also assigned a high probability of maliciousness. The embedded URL, https://traffmen.ru/123?utm_term=binary+tree+zigzag+level+order+traversal+using+queue, is the primary indicator of compromise, likely leading to a phishing or malware download site. No scripts were extracted, but the PDF structure itself contains malicious elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=binary+tree+zigzag+level+order+traversal+using+queue In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f8c9e8e48545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5fdd42dd471a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489993/normal_5fc44eac53cbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fca1a9ec5f19.pdfIn PDF document text
    • https://guwewekotijiz.weebly.com/uploads/1/3/4/7/134714515/jalimokiza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369781/normal_5fe44d58016ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5fb00fd70bf0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fae6a195e8c9.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://uploads.strikinglycdn.com/files/ccd2020c-bf79-4564-a2d8-d81fa37ffe8b/jipapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e326bb-c54e-416b-a1f7-df743d7c967f/71425763008.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/runescape_elite_dungeon_3_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/96454260087.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/numomuvatuwiju.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_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 5260 bytes
SHA-256: 6a270b4be360e0b3b73b1aa06ba12720eb88f1776afca85c0852cd9fe7767e7e
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 11996 bytes
SHA-256: e4ec6d27b22d8f344c8fe335ce5a29a29ab349aea426321dd3d0b8d4a3a6bdcb
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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