Malicious PDF — malware analysis report

Static analysis result for SHA-256 93374146356ac0da…

MALICIOUS

PDF

81.9 KB Created: 2021-04-06 09:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38cb8216738f374cce23db54e1042ebb SHA-1: 61ce66a5b718d93627df867b9c3e6bfce8764776 SHA-256: 93374146356ac0dac172d40ec0b9b48627e4748be59b14706e713f4885bca808
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs, specifically one pointing to 'zajinet.ru', suggests the document is designed to redirect users to potentially harmful content or download further malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=evolutionary+analysis+5th+edition+pdf+free
    • https://cdn.sqhk.co/masunidupag/knX6Vhh/tazefamumewatone.pdf
    • http://supportcopyright.net/188168548518akss.pdf
    • https://cdn.sqhk.co/tijanukubo/Fi71jic/83287729475.pdf
    • http://formblckr1.xyz/14888438757rv9aa.pdf
    • http://jemulobapamiwu.mywebcommunity.org/arabesque_1_piano.pdf
    • https://cdn.sqhk.co/kibutonap/iaig4he/mother_earth_brewing_co_nampa.pdf
    • https://cdn.sqhk.co/pixazizaze/w6jhia6/ferane.pdf
    • http://xojuxelase.medianewsonline.com/19387023167.pdf
    • https://cdn.sqhk.co/butiluluvuk/3hjgjqU/chex_quest_wad_zdoom.pdf
    • http://wetepuzasuvuroz.22web.org/bhagavad_gita_chapter_12_english.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ledukuxadom.epizy.com/28805798177.pdf
    • https://uploads.strikinglycdn.com/files/64efbdc5-b2ce-414e-9d04-8497111492bf/dyson_cyclone_v10_animal_cordless_vacuum_review.pdf
    • http://vekamodadon.onlinewebshop.net/34463377941.pdf
    • http://wipibefab.onlinewebshop.net/gesemadepepul.pdf
    • https://uploads.strikinglycdn.com/files/50d2fb4c-e73a-4ee2-9d34-91658d06e96c/70832726813.pdf
    • http://zojimako.rf.gd/job_application_letter_examples_free.pdf
    • http://jawuwibunoropo.atwebpages.com/88111813952.pdf
    • https://uploads.strikinglycdn.com/files/508ffdef-1c38-4536-9b2c-619f0ec70789/2014_chrysler_town_and_country_service_manual.pdf
    • http://dujepuxa.rf.gd/policy_guideline_template.pdf
    • http://tonezifimoraga.epizy.com/41596536857.pdf
    • http://fofifalog.rf.gd/xuvutimojawidajewote.pdf
    • http://nolexaguluzu.epizy.com/bojinurajefokevafivogaza.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010182.bin
aa7408150ceb808a2ef4671a929978ce859b79590eeaf1bff9d9ba984ae7e4c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 5372 bytes
font_01_sfnt_off000113d8.bin
75fc2d9c83e4551c89b38a0c2fe8f4bce3634b5a279b0fe2707be2927dc0cbca
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 11488 bytes