Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e02998f9d537974…

MALICIOUS

PDF

80.8 KB Created: 2021-01-12 07:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f3c8264d2dcbbee994a33379550c4454 SHA-1: 70a4228eee2a23e321404315c1e8d61fb622e6a1 SHA-256: 8e02998f9d537974fef52eed550e997fd9b208cd6e6c4de76c51ecda173be779
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, one of which is trafftec.ru. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=formal+operational+thinking PDF link annotation
    • https://site-1168079.mozfiles.com/files/1168079/38834199937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5ff346508872f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_5fa905cdd6baf.pdfIn PDF document text
    • https://site-1176476.mozfiles.com/files/1176476/jack_o_lantern_ideas_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5f9a687933b70.pdfIn PDF document text
    • https://site-1168056.mozfiles.com/files/1168056/rock_talk_messenger_chat_download.pdfIn PDF document text
    • https://site-1176438.mozfiles.com/files/1176438/space_invasion_alien_shooter_war.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/joyia6r/paradise_island_bahamas_airport_code.pdfIn PDF document text
    • https://site-1167942.mozfiles.com/files/1167942/bosch_gsb_13_re_professional_manual.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/gewisetug/printf_date_format_bash.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/bangla_valobashar_golpo_boi_free.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_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 5076 bytes
SHA-256: bafb7c67e55237749be0b633632a7325eef35853045ef511682842c2ec7b0db3
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 14204 bytes
SHA-256: e600c721ecf15215cd5febd15aba31eef2052201fe4be7906a89259d22ecaba4

Open this report in the interactive analyzer, or submit your own file for analysis.