Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfab07b670c75fe7…

MALICIOUS

PDF

66.4 KB Created: 2021-01-06 07:37:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 027477f1064f1c6441326d5ef2dba546 SHA-1: 16d01972ea39d547290f22473c2f496d1052bb2d SHA-256: dfab07b670c75fe7c546361d7aa3bada36c3deafdb016ea506dacb6102e1b84b
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external links, with one pointing to 'traffine.ru', suggesting an attempt to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=conduction+convection+and+radiation+worksheet+tes
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/3ca523acde.pdf
    • https://cdn.sqhk.co/miwizawi/idjhhiQ/visual_studio_code_github_integration.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d057b10c-2f63-4905-9331-44a08c7572dd/mcat_scores_for_do_schools_2019.pdf
    • https://s3.amazonaws.com/luxaduzimase/tariwanej.pdf
    • https://uploads.strikinglycdn.com/files/512b19d3-b04c-4060-bd1a-0578b6cfb4e1/makepefat.pdf
    • https://s3.amazonaws.com/fizup/brushless_dc_servo_motor.pdf
    • https://uploads.strikinglycdn.com/files/81df59a0-2676-4cc5-93bc-f992190b4e75/pourquoi_jai_choisi_ce_stage.pdf
    • https://uploads.strikinglycdn.com/files/6d28b853-7f58-4bc2-b700-4edc470992c0/fujuveropukibuvu.pdf
    • https://uploads.strikinglycdn.com/files/ed5beea3-11ee-4a1f-ac64-d8284ab4377a/97601453788.pdf
    • https://uploads.strikinglycdn.com/files/4dc79d1d-5159-40e5-9d92-4cd1c2a1a8af/gonubawexudolar.pdf
    • https://s3.amazonaws.com/migivewuwe/nidasisub.pdf
    • https://uploads.strikinglycdn.com/files/ef282c2a-7059-4c58-85bd-71452f0baeca/52262933040.pdf
    • https://uploads.strikinglycdn.com/files/f7875cf0-aed4-418f-b11f-494123c9f720/nudonoduruzataja.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_off0000c961.bin
6ccadec832e6ed971a5e0369562c662e87c0201a43a8c01f4280731641aacc89
pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 5116 bytes
font_01_sfnt_off0000dad6.bin
6a4cbbe487ec14986f6abd3d7a0dea7c90d2e227a017988dc175701925805254
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 9792 bytes