Malicious PDF — malware analysis report

Static analysis result for SHA-256 8748031686bc3c24…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 00:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15dadb81a0eb6b7890defcc4fbf770be SHA-1: 29324ed2f41876fe43554d1b419911b7e1d60a3c SHA-256: 8748031686bc3c2461dae1c5e015a9bf504e671fd140841ee26b8ed48d02fe26
116 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were extracted, the presence of numerous external URLs, many with unknown reputations, indicates a likely attempt to redirect the user to malicious content or phishing pages. The document body itself is heavily obfuscated and unreadable, but the metadata indicates it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/award?keyword=assembler+pdf+avec+foxit
    • http://polokuvek.iblogger.org/ximaduvupizafopatir.pdf
    • https://cdn.sqhk.co/lumolixuwo/idchihq/fruit_ninja_game_free_download_for_pc.pdf
    • https://cdn.sqhk.co/zevinikiwi/eyD2nya/best_club_penguin_puffle_names.pdf
    • http://pidawiwosoda.iblogger.org/sivosibuvuxajifi.pdf
    • http://dostafood.xyz/nuwikigapexorusudixytjdi.pdf
    • https://cdn.sqhk.co/fomolunuvufa/ageXOpj/free_tubal_ligation_reversal_near_me.pdf
    • https://cdn.sqhk.co/pigexebobe/aPpAAco/mojekoz.pdf
    • http://poguferuliwu.iblogger.org/rogokedepujut.pdf
    • http://fesilibokedej.iblogger.org/topography_of_the_ocean_floor.pdf
    • https://cdn.sqhk.co/kixepijap/qhfhgYX/xamalukewa.pdf
    • https://cdn.sqhk.co/nawovoso/1dja5ij/virtual_drum_set_online_free.pdf
    • http://vertitribe.store/modern_world_history_textbook_9th_grade0390a.pdf
    • http://astrology-personal.online/1964070164z8ezl.pdf
    • https://cdn.sqhk.co/fapolokid/cjcgSHY/nalarinabulibunasunavo.pdf
    • https://cdn.sqhk.co/dedizozife/hbghjLf/icas_maths_past_papers_with_answers.pdf
    • https://cdn.sqhk.co/jesisuvov/AOhjhiz/mechanics_bank_auto_loan_phone_number.pdf
    • http://rejexinek.22web.org/boatsmart_study_guide_2020.pdf
    • http://navaxubigidinaf.iblogger.org/718209558.pdf
    • https://cdn.sqhk.co/wolanojijen/m4FXRjc/vajifapamukijazafuxazub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zemodofu.epizy.com/electrical_engineering_interview_questions_and_answers_free_download.pdf
    • http://katetagozu.epizy.com/rolejik.pdf
    • http://fudedeki.rf.gd/65235124073.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabf.bin
d94da125682542b93c7aff6d0656167efc2456b38a2a8a54203bca620e0d0c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 5560 bytes
font_01_sfnt_off0000fd93.bin
8e619d007a207339d1aae948d0bb31970a301a9a649f7352f97d5545d18820b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 12732 bytes

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