Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f8dc6254fb74df…

MALICIOUS

PDF

70.0 KB Created: 2021-02-22 13:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ecaef5bad5f84eee9c55f0d5ba920c15 SHA-1: 87726d11b35a2ed65e6c6a59382b5a0e7131c4e3 SHA-256: d7f8dc6254fb74dfd5f6f917adcc98a38b11c2aa0e25dbe7672740d8a3f5898d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'seumenha.ru', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'Beginner's guide to sketching'. No scripts were extracted, but the presence of external URIs and the malware detection indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wb?keyword=beginner PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404121/normal_600770bce3600.pdfIn PDF document text
    • http://optarfes.com/4691128947706unh.pdfIn PDF document text
    • http://optalpha.com/77081508370e7nuo.pdfIn PDF document text
    • https://wijejotuxaketuv.weebly.com/uploads/1/3/4/3/134338978/a6502b80ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420748/normal_60095070928cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_5ff639da9b744.pdfIn PDF document text
    • http://fortuneo.biz/anna_karenina_book_online6nhdh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_60252f7943cea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sixuregorajaso.rf.gd/83347718370.pdfIn PDF document text
    • http://telagivepovadul.epizy.com/davuritelinufomeriwodutuv.pdfIn PDF document text
    • http://mevonaku.rf.gd/biographer_script_font.pdfIn PDF document text
    • http://tugefewose.rf.gd/girlfriends_guide_season_3_episode_2.pdfIn PDF document text
    • http://lozekav.epizy.com/xexoxegox.pdfIn PDF document text
    • http://keporumutiwem.epizy.com/pdf_file_format_meaning.pdfIn PDF document text
    • http://xazitew.epizy.com/champion_film_odia_song.pdfIn PDF document text
    • http://vesuduw.epizy.com/duduzenoxidubid.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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 5576 bytes
SHA-256: 3a0a5db62b996e3906abba97fd2b836dbcece9a18d7cd46340f75c70fe144587
font_01_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 10636 bytes
SHA-256: bc6d8dfd926a577f4abfca65cc4cd913a384dec96d76a8419c917b243778ab5c