Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc6ed05596bcb9f…

MALICIOUS

PDF

73.3 KB Created: 2021-01-09 06:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 39bf3a13c268d4a334bc91a2c40cd9c3 SHA-1: eb68bab155cbefdb6f179fea87785d72627111ad SHA-256: adc6ed05596bcb9f4eb806fa4e3e3bcd083dae0a93674971f0887cdcf803c935
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly 'traffine.ru', are identified as malicious redirectors, suggesting an attempt to lead users to phishing or malware sites. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection point towards a phishing or trojan delivery mechanism.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/123?utm_term=rochester+intermediate+school+principal In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409123/normal_5fa821d4f30d6.pdfIn PDF document text
    • https://rineragafuvotut.weebly.com/uploads/1/3/4/4/134442037/bf343a17345b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5f9075668ff7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/01301932-38de-4af4-abfd-1e2a7a406edd/sisugadojol.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/high_speed_video_er_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/39129790902.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/82814549619.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/17496784144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df84e1bf-f28a-4e96-9bb3-7ea733c6b693/visual_motor_activities_teletherapy.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/litizovobobudewovelasate.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/whatsapp_app_for_windows_10_pc.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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 5320 bytes
SHA-256: 044465690e620df1f760daa308a22ad75279e544a50b0f8d999fc267a0cdb360
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 11368 bytes
SHA-256: b494dfe5ee4f0a565bfd002072e81caa1271f193623b08debf885df8663b9056

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