Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b364affd694753…

MALICIOUS

PDF

85.9 KB Created: 2021-01-22 02:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 87be608d35e821109b9ab721500e73e4 SHA-1: 10d4fa26826c626455f0468f8389ff37fb209389 SHA-256: a8b364affd694753cf95978125ebf54ae6dc5ba2ba9f38fb5c9541613096cea3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with 'traffset.ru' being a primary example. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to potentially malicious sites or for SEO abuse. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffset.ru/123?utm_term=no+man%2527s+sky+ship+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388842/normal_5fcc215a3e37d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378621/normal_5fde654a954ed.pdfIn PDF document text
    • https://jevogebog.weebly.com/uploads/1/3/2/3/132303093/mitaruli-jobof-lebukilexal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5fde342ec7b8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fec830d19cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_5fe73bcd0961d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5fffa6bb1da53.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/9510253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5fec30e2bdbbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5fd05312255a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonimegalidoxu.epizy.com/2392245024.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/social_psychological_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/audio_new_song_indian.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/99390574119.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/nursery_school_worksheets_free.pdfIn PDF document text
    • http://tukorokibenej.epizy.com/tamilrockers_2019_full_movie_petta.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/queratitis_por_acanthamoeba.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/bonjour_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/dilezagikutimunagosekobo.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/black_eyed_peas_songs_list_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_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 5416 bytes
SHA-256: acf5102a3fb184536286d86572df44f6500cf8ffb6ddf4c315658890fa1f07eb
font_01_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 11040 bytes
SHA-256: 8da9387d63249373afa55673fc89bebeb105873ebb0c92e426a7564b37d170b1

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