Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a3361f3c47f555…

MALICIOUS

PDF

67.0 KB Created: 2020-11-20 10:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8bc9301144b86a62b5fca4ccfd7a9c SHA-1: 184065ef8428e48e47cf065af242b8bff020dfa8 SHA-256: f3a3361f3c47f555c72f4825359370b97c6a83f0020888b0382401d97580880f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://traffine.ru/123?utm_term=how+to+calculate+joules+of+kinetic+energy
    • https://kagadema.weebly.com/uploads/1/3/4/4/134456650/003e8ef571bed3d.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/jawemepuwiwifisuluf.pdf
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5fa0bdef9e392.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotenukevepunin/2017_ginseng_prices_in_alabama.pdf
    • https://s3.amazonaws.com/divexikav/pirate_bay_unblocker.pdf
    • https://s3.amazonaws.com/kulinisokakewi/editorial_writing_campus_journalism.pdf
    • https://s3.amazonaws.com/roware/good_names_for_tortoiseshell_cats.pdf
    • https://uploads.strikinglycdn.com/files/e7189b90-aa81-465a-bbaf-68d317a28407/80792389374.pdf
    • https://s3.amazonaws.com/muvemasoxaji/synonyms_and_antonyms_activity_sheets.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/2167436134.pdf
    • https://s3.amazonaws.com/kezemiradigu/bitcoin_gratis_2018_android.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_off0000c7b0.bin
812c9c25e2666650bda3fe04cd89360f0eac94be7e8bc28c80a3d7263a3b986e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B0 5344 bytes
font_01_sfnt_off0000da0d.bin
7cfc0008658b4b7114406d2e3ba07e32b711733e0417e26c20c3ad0200e3d7f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 11044 bytes

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