Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a331f5b78c0273a…

MALICIOUS

PDF

67.9 KB Created: 2020-12-20 05:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0fdf872d6f9fc2a01ce46c673bc6e831 SHA-1: c896f09c9c3fe37a9724bbe0545cdabab0da102d SHA-256: 4a331f5b78c0273a405ed6a308d38517fa750886132b2a8fc16cd14ec5d586ca
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing campaign. The embedded content, though heavily obfuscated, likely serves to direct users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?utm_term=garbage+truck+song+lyrics+blippi PDF link annotation
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/7543388.pdfIn PDF document text
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/4a56b0.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/babesipaxuvujemefuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0fa69ee0f32b871b4d8f/1606291367578/broadcom_ush_driver_dell_latitude_e6410_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e572b57-61f6-4837-9c06-c0ee06d1f229/eric_clapton_before_you_accuse_me_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ebbaa9-3c7c-4a51-b540-bd1ca638c8d3/dawowitezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3aa827-b89f-4263-aaa3-b97e0850b765/juwidiwabeguziz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9112e18b-8f65-4856-8210-d23392775429/insidious_1_full_movie_indo_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a84e44c-ed9b-46b6-9f57-8e425c894a81/wanesofirave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9609247d-11be-4dd9-959e-0406189a5244/41057289336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae01449a-3b1a-4e64-887c-c2c549e7464a/20393686923.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_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 5440 bytes
SHA-256: 366db42fe299d92e61518fe7feee7d539b218c4204f0da49a145113c3cf97f84
font_01_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 10764 bytes
SHA-256: 4c7e7e7cffdc87ff4204012190cbec507c8174169075b56c2fec31afb39326c0

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