Malicious PDF — malware analysis report

Static analysis result for SHA-256 386f5a0a01676421…

MALICIOUS

PDF

67.4 KB Created: 2020-11-25 05:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55db49928b603c4f2d2d35dc5ac34045 SHA-1: 1d1d505f04dacf713fd816e5e49caf29a5ff247c SHA-256: 386f5a0a01676421fed4af8433abf2843c8ff56c075f12f72f7c591be9e890d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDFs hosted on various platforms, suggesting a link farm or SEO poisoning tactic. The primary URL, https://trafffi.ru/strik?utm_term=pathoma+fundamentals+of+pathology+2019+pdf, indicates a lure for specific search terms. ClamAV and ML classifiers also flagged this PDF as malicious, likely phishing or a trojan.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=pathoma+fundamentals+of+pathology+2019+pdf
    • https://zuzimarubafa.weebly.com/uploads/1/3/4/7/134712841/pibiralunudebipebik.pdf
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/1033800.pdf
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/9f1ac3284bbb.pdf
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/waxixiluzon.pdf
    • https://mazazogadof.weebly.com/uploads/1/3/4/3/134374066/boxulawafa_manalirul_nagefab_bidev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/golepe/38148046568.pdf
    • https://uploads.strikinglycdn.com/files/dc014ad2-c80b-4dcc-91a7-2941e3f2d6bb/google_play_services_apk_11.5.0.9_230.pdf
    • https://uploads.strikinglycdn.com/files/4ec22f9f-dc62-46db-8de1-f1ee788abb57/wulitikirafetituvudipot.pdf
    • https://s3.amazonaws.com/nigimul/clinical_interview_techniques.pdf
    • https://s3.amazonaws.com/xanebavifamopez/97966436129.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/wozamexamebisukizadirag.pdf
    • https://s3.amazonaws.com/radubozufiwo/marksheet_of_upsc_topper_2018.pdf
    • https://s3.amazonaws.com/dezajok/gold_s_gym_elliptical_350i_manual.pdf
    • https://s3.amazonaws.com/dozuga/last_airbender_full_movie_in_tamil.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_off0000c816.bin
e0bd5f057d16a40d39c69fe44de58213174cfc53061f9fbedd91e262c3ac06dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xC816 5944 bytes
font_01_sfnt_off0000dc44.bin
a59b346091a220bdb053028f1973936082da84dfbf2924e5c631923562525130
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 10808 bytes