Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d7a5bb70c438d2…

MALICIOUS

PDF

71.9 KB Created: 2020-12-25 11:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7d8da1482c0619a7c25a21c21752ffda SHA-1: e899ee11411dc69856332afc66ae93550198d361 SHA-256: a6d7a5bb70c438d28e80205e2fe8108913df7aea37569a3d816973addaddbea9
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs to a suspicious domain, identified by heuristics as an external URI and flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'Liar's dice board game printable' and the wkhtmltopdf application, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://trafftec.ru/strik?utm_term=liar%2527+s+dice+board+game+printable PDF link annotation
    • https://cdn.sqhk.co/lisutovudaf/hdd8UAV/chennai_super_kings_players_salary_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/buwepexe/KKlghCH/nick_mullens_stats_college.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/sales_executive_cover_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/87316029755.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/verismo_701_operating_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d16927-10d8-4b8b-a479-de7b1fa26b47/6134879143.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/capacity_customary_units_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/mogepuxisopunabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ce9ade-92c3-46b7-90e3-5a963b344942/4215062720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7402f7f4-0e82-4e06-b22e-2bef2dda4b46/alternative_guide_to_baby_names_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/rinamusobunepem.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/samsung_android_mobiles_below_10000.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/8007129567.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/black_bear_diner_application.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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 5508 bytes
SHA-256: 02495d4bbc011f5cc5af0769b09ee99d398d9d5b29ead839c804061a2c44347d
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10340 bytes
SHA-256: 26db767eed38cdcd3edec556deac313877dee2cd7e69fd94d4bcc656382abe3b