Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b943c5208bebbbb…

MALICIOUS

PDF

77.5 KB Created: 2021-05-16 11:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc1e3b5a907812df50a74406c1087ea3 SHA-1: 20cdb99ef229f5f8302247115d5d619e79b8c452 SHA-256: 0b943c5208bebbbb99ab32026cf1a5437dad7868f88f3135040a5058ed65d344
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded links pointing to external domains, many of which are hosted on disposable or suspicious domains, suggesting a phishing or malware distribution scheme. The presence of JavaScript, although not directly executed in this static analysis, is a common vector for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+is+the+a1c+range+for+type+2+diabetes PDF link annotation
    • https://cdn.sqhk.co/wajuletixex/Zjg69ie/ultimate_epic_battle_simulator_steam_key.pdfIn PDF document text
    • http://tujomof.22web.org/el_amor_en_los_tiempos_del_colera_resumen_completo.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/bifDjd0/air_hockey_challenge_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/bigWihd/vakawom.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/gfjfgdt/pamowomulataduzuvivisav.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/PGgggdt/son_of_zeus_ares_title_crossword_clue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5fe8fc535614e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_6060e635a4c91.pdfIn PDF document text
    • http://bevojufonurol.iblogger.org/dolch_sight_word_worksheets_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_60061d74035f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_60192e2ca42da.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/ghhjhbV/25269876207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_60134db78493a.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/hhuhdig/pirate_gold_pinball.pdfIn PDF document text
    • http://busotokebos.iblogger.org/atkins_jones_quimica.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/jDig5kI/50631231326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/89301157-6502-4da7-9da9-2f71e25463f1/intellectual_property_law_books_uk.pdfIn PDF document text
    • http://xewofikedufika.epizy.com/introduction_to_valuation_the_time_value_of_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84bd026-8698-48ff-bb1e-a7c181dfcfbf/soccer_gym_training_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ad7b00-3056-4c71-b144-cc94e379a1be/sofugunimijuki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 5612 bytes
SHA-256: 3cbfc7d8b9144daeb26713ad1b0a880b6f398cd7ac5a93b437fdf8e8cf902ff3
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10664 bytes
SHA-256: 6077aa04707bd452f51beacc5bbfb43fe09c3a72f68cbe682cd3c3403fb411e4
font_02_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2