Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d08acab6a10a3ad…

MALICIOUS

PDF

76.3 KB Created: 2021-02-20 09:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: de239cdb94ce599223cbc489e47eab35 SHA-1: 5300bc5726035aed69acbd98b0ddd62114148489 SHA-256: 3d08acab6a10a3ad93e64ce4f1738ae66a837ff959251d3d032dff36dfd15528
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+do+you+say+would+you+like+a+cup+of+tea+in+french PDF link annotation
    • http://latomixoxa.iblogger.org/darkness_rises_apk_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_60294887ec357.pdfIn PDF document text
    • http://wijalejumodu.22web.org/mysql_for_beginners_-_self-study_course.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_5fd6632140454.pdfIn PDF document text
    • http://tadunikij.22web.org/link_s_awakening_remake_strategy_guide.pdfIn PDF document text
    • http://kleomaften.online/outlook_android_activesync_settings1davw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_600d3d4351c1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://samanoniminowut.epizy.com/adjectival_modifiers.pdfIn PDF document text
    • http://fakadigat.epizy.com/fapuvatefaletasukovoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/imperative_english_exercises.pdfIn PDF document text
    • http://sitojedakolotil.rf.gd/93721557453.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/nomozi.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/ableton_trance_template_free.pdfIn PDF document text
    • http://kodekexonalana.epizy.com/super_mario_3d_land_world_4-2.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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 5464 bytes
SHA-256: 555ac19cc878efb7d2c7bac175f3ccd22b75c6e2a3ab199ad053aa1e3863f22c
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 11132 bytes
SHA-256: 08204cd460babab5b8df1deb19d5816f963a92330ac039157ead686015e24890

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