Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa30c12c0d4b134…

MALICIOUS

PDF

77.7 KB Created: 2021-01-15 19:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdbc261022cfeb97e0208d26d98c9f12 SHA-1: 8964b81d75c3ad530c871a8721c78e6b2c45feae SHA-256: 4aa30c12c0d4b134ee3d5b1da053e99459cf04cb460496a146c71e17cd7460d7
214 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to known malicious redirector infrastructure or link farms designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of malicious URLs is sufficient evidence of a harmful attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/wb?keyword=pictoword%20fun%20word%20games%20offline%20brain%20game
    • https://valogasode.weebly.com/uploads/1/3/4/3/134320371/1473396.pdf
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/4988517.pdf
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/kixovukogifixu.pdf
    • https://cdn.sqhk.co/xubulozirod/ih3hhhc/jekopozobu.pdf
    • https://naxugowepuf.weebly.com/uploads/1/3/4/5/134595603/vafubaf.pdf
    • https://jiwepeduvebata.weebly.com/uploads/1/3/1/4/131456267/7214057.pdf
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/7102566.pdf
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/7784349.pdf
    • https://cdn.sqhk.co/rijatazuga/jhhd0ja/1943135751.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jazofi/97468243918.pdf
    • https://s3.amazonaws.com/gifiz/wam_wave_model.pdf
    • https://s3.amazonaws.com/wanasuvedigo/winesexewokepobux.pdf
    • https://s3.amazonaws.com/gazivemon/69288911754.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e526.bin
e70478cc9935f3b4e9f96997c745bb382089c9363b17a0051c9a94466fe434e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 5456 bytes
font_01_sfnt_off0000f79e.bin
d091c1a7c906646e51e8e9e841ee2891871e529ef23b28688367cfc3a9a6a558		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10548 bytes
font_02_sfnt_off00011b85.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 4324 bytes

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