Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a6db8d64624d47…

MALICIOUS

PDF

71.1 KB Created: 2021-02-28 04:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8abb851d9deca9cbea13682f69fe7c59 SHA-1: 7af2b9b61f325af99ea232fe0f2c24c08ea6f824 SHA-256: 78a6db8d64624d474b66da67f30e9d963113b27d871fd7e5eacf205e44e20239
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain likely used for malicious redirection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://vilenefex.ru/strik?utm_term=how+to+draw+a+hand+turkey PDF link annotation
    • https://cdn.sqhk.co/riroxale/gdo8KnW/my_piano_phone_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/gjcVicf/69162020247.pdfIn PDF document text
    • http://lupaper.22web.org/85399421934.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/gcSdjb8/coda_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/b6hhQhc/candy_smash_mania_game_download.pdfIn PDF document text
    • http://logunej.iblogger.org/1246727687.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/CUhfhcn/17460194657.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/bTuieAR/dancing_ballerina_ballet_dress_up_fashion_show.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/hfoDWgf/download_game_tower_conquest_mod_apk_offline.pdfIn PDF document text
    • http://danivufulof.iblogger.org/ascom_i62_handset_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/IjaqWju/.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/oygdiar/marxist_beliefs_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexaniruvuwuwe.rf.gd/20024626198.pdfIn PDF document text
    • http://zibemivajuwoma.rf.gd/how_to_use_the_color_wheel_to_dress.pdfIn PDF document text
    • http://japunulu.rf.gd/mandated_reporter_training_online_alabama.pdfIn PDF document text
    • http://xuwiviw.rf.gd/briggs_and_stratton_17.5_hp_engine_parts_manual.pdfIn PDF document text
    • http://rokabimokow.rf.gd/think_through_math_answers_8th_grade.pdfIn PDF document text
    • http://midowadijurufak.epizy.com/berthelot_equation_reduced_form.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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 4920 bytes
SHA-256: 551960f4cad60f5d8d07ad4f68a94193939582bbd82bb5e821434117940eab6c
font_01_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 9944 bytes
SHA-256: 81cf8b4897833078b3a02e67a6a7d07e06c035e22867533506b560736edbb8b9

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