Malicious PDF — malware analysis report

Static analysis result for SHA-256 437b97b5f4d73249…

MALICIOUS

PDF

66.1 KB Created: 2020-11-25 11:20:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67a27c6eef05d388979d1eb63fae78b5 SHA-1: 1b882dad1126c2a3dcf7d70bbcfcdc1b2e7a9bd2 SHA-256: 437b97b5f4d732498bea19706d823a5b8b8b36b8b9c1f3dc742e4cec1916bf87
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'traffmen.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, with 'varivupe.weebly.com/uploads/1/3/4/4/134480773/9485334.pdf' being the first identified. ClamAV also detected this as Pdf.Phishing.Trojan. The ML classifier output of 0.999764 further supports its malicious nature. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=dirt+bike+kawasaki+150
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/9485334.pdf
    • https://cdn-cms.f-static.net/uploads/4464542/normal_5fadf959c3d07.pdf
    • https://cdn-cms.f-static.net/uploads/4450038/normal_5fa50e46bb0e6.pdf
    • https://cdn-cms.f-static.net/uploads/4460981/normal_5fad35a87940e.pdf
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f9315baf0ad3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2997b6e0-fa7a-46e9-a137-42dde4cc3262/lukokaroviga.pdf
    • https://uploads.strikinglycdn.com/files/08ccc7bb-97c3-4c99-876e-b1355cf1e28f/kolitizoduxasase.pdf
    • https://s3.amazonaws.com/sugowubuf/livukizaxepasuligemuxub.pdf
    • https://s3.amazonaws.com/zategafozasiru/vegifewosewesefelami.pdf
    • https://uploads.strikinglycdn.com/files/3c72d50c-8af2-4224-a443-93a43aaf7d20/kenavusopenaranofokew.pdf
    • https://s3.amazonaws.com/wizedumi/baptist_church_covenant.pdf
    • https://s3.amazonaws.com/tobovunoberiki/lamibafinibubutip.pdf
    • https://uploads.strikinglycdn.com/files/20dbf195-0a3b-4e9c-b776-116853984066/74557578347.pdf
    • https://s3.amazonaws.com/bupesejirijejus/kigemalazekirosefobe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c747.bin
669fb609e422585b26211b6a28c0a6b7dbcb4fdb9dd8c119497b0d97171d8b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 5260 bytes
font_01_sfnt_off0000d95d.bin
599bf6dcb9c7a1c5bc9f4fa17383efcfeba16bff090862b8c521d0f8d3efb26e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 10616 bytes

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