Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c19b9c61007a172…

MALICIOUS

PDF

66.6 KB Created: 2020-11-21 09:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceff76984985fa262040fa1d22dd0a9f SHA-1: 78b2a7d6a4dddf80b3e657327f45df95ae09a5f2 SHA-256: 8c19b9c61007a1725c0360b2593fc8a26b13add5045a36fc2672872c15641286
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though partially corrupted, suggests a lure related to a product listing, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffmen.ru/123?utm_term=crate+and+barrel+intarsia+console+table
    • https://cdn-cms.f-static.net/uploads/4447885/normal_5fb2a4c361e42.pdf
    • https://cdn-cms.f-static.net/uploads/4404500/normal_5f94d7586f1ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/begijufadi/decaf_kona_coffee_k_cups.pdf
    • https://s3.amazonaws.com/wusone/jibapamumatapo.pdf
    • https://s3.amazonaws.com/memexelu/agonistas_y_antagonistas_de_gnrh.pdf
    • https://s3.amazonaws.com/regovadeje/21762167879.pdf
    • https://s3.amazonaws.com/jamokaroxoj/22456278914.pdf
    • https://s3.amazonaws.com/begijufadi/the_industrial_revolution_answer_key.pdf
    • https://s3.amazonaws.com/banula/braveheart_full_score.pdf
    • https://s3.amazonaws.com/rekibedafowow/38874056995.pdf
    • https://s3.amazonaws.com/felasorarabipis/tamipobavuw.pdf
    • https://uploads.strikinglycdn.com/files/2e395594-3c13-4324-b62f-1b339c5be530/unblocked_video_websites_besides_youtube.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_off0000c55a.bin
1d7d571e52b32c8b690a3755c40d0105ba0f755059a40a8d663f7a0b2ced3667		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC55A 4980 bytes
font_01_sfnt_off0000d649.bin
e0bc89f5e46bc1ea311404d5949a5b148fb50ca666d617920ab903019be5ed00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 11008 bytes

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