Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d83ceb6ad35af8…

MALICIOUS

PDF

72.2 KB Created: 2021-04-20 03:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b41a28ca3f4bbd86f1097104618e9cdd SHA-1: 559128d6615b9f798ed211af1e1f6c01ce9fcb38 SHA-256: 81d83ceb6ad35af8c5c22ab8347f02ba5e14219234115ab77bb6d69965d47e3b
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to searching for the value of a sewing machine, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+much+is+a+kenmore+sewing+machine+worth
    • http://good-production17.site/pupedofixivizevivigesecpahf.pdf
    • http://antonioit.fun/74726223437p1jz6.pdf
    • http://paxawujaxoda.22web.org/63523008146.pdf
    • http://copytoshka.ru/72802440686il2si.pdf
    • https://cdn-cms.f-static.net/uploads/4421782/normal_6028eb29e16a0.pdf
    • https://cdn.sqhk.co/sikibeve/JEg7ign/woodworker_express_free_shipping_code.pdf
    • https://cdn.sqhk.co/wejawujagi/dldifqO/anatomy_abdomen_mcqs_with_answers.pdf
    • https://cdn.sqhk.co/fipufose/hdhh15B/hearts_of_iron_4_mods_download.pdf
    • https://cdn-cms.f-static.net/uploads/4447270/normal_5fd67fce7a40a.pdf
    • https://cdn.sqhk.co/likamigid/XHjhhfc/maths_crossword_puzzles_with_questions_and_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4445731/normal_601f1f63bfe2e.pdf
    • https://cdn.sqhk.co/guwuweri/UoOLjir/dragon_snake_care.pdf
    • https://static.s123-cdn-static.com/uploads/4376874/normal_60073fed58ec0.pdf
    • https://cdn-cms.f-static.net/uploads/4485176/normal_601f31b6b255e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f15d8d23-1a91-45b1-ac9b-a5bfa5bfd608/renorezufunaxoj.pdf
    • https://uploads.strikinglycdn.com/files/12e62dbc-cea9-4095-bc45-ad4a8a4378ab/hp_2013_ultraslim_docking_station_power_supply.pdf
    • http://vokunewegulu.epizy.com/jikefagodatasavosaradeti.pdf
    • http://selifesupenikiv.epizy.com/pozubim.pdf
    • http://tinasixubu.epizy.com/jujusafivinuwu.pdf
    • https://uploads.strikinglycdn.com/files/a627a940-4df8-4c84-86a2-122b16e2f4c0/how_does_briggs_and_stratton_never_change_oil_work.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_off0000dcbc.bin
4df960f2b5faef09a195fd61cedbe06f0042a290368ee792093566b0893d0141
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 5296 bytes
font_01_sfnt_off0000eeab.bin
bc4740c71a7a8293f902fd05188d537136c0f94e1fa2de9e75a758978f66f036
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 10556 bytes