Malicious PDF — malware analysis report

Static analysis result for SHA-256 b821021859d9f244…

MALICIOUS

PDF

77.3 KB Created: 2021-04-04 15:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 21e8d03b57d7d19549fb3663ff39060f SHA-1: 55c2ada1b4aeb2f5469c958f7741eec17e2d44a0 SHA-256: b821021859d9f2449d1e4d2ce6c989da4318a4405a3da54bb3ffb8cf133e04d0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body, though heavily obfuscated, suggests a lure related to technical issues.

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://jacksth.ru/strik?utm_term=why+does+my+viper+remote+start+not+work PDF link annotation
    • http://alexsaf.ru/lopoxemidisofaxamikowp6m8.pdfIn PDF document text
    • http://keepmaxi.space/sosumiz20rsh.pdfIn PDF document text
    • http://legiontry.online/that_s_amazing_card_throwing_trick_shots_2hm4af.pdfIn PDF document text
    • http://haifaiv.ru/88652230508j2yy9.pdfIn PDF document text
    • http://mimisijuz.mypressonline.com/19701851722.pdfIn PDF document text
    • http://prodive.su/kung_fu_panda_3_characters_in_real_life9c52n.pdfIn PDF document text
    • http://bio-ita.fun/can_alexa_answer_incoming_phone_callsjc1g1.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/pegubonobepesubet.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/14867135071.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/whistleblowing_policy.pdfIn PDF document text
    • http://triple-doska1.club/the_wisdom_of_insecurity_audiobook11o2r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/auriculoterapia_en_esquemas_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/46310958797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886561dc-8034-4010-afd5-e103a761c193/nuvata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9721aef2-93c7-4a06-bcd3-780057dfbec3/does_garageband_support_plugins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a4ad64-262c-437e-8877-db44658b69e3/la_magia_del_orden_marie_kondo_sinopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156ba29c-de4e-4b26-b987-ccf2503dea75/hampton_bay_ceiling_fan_remote_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c883c4b1-b644-4644-acc7-3b3af2ffad4c/a_series_of_unfortunate_events_netflix_last_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/15676504214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df5f610-0e96-4092-9d4f-a1b19edb5b19/where_to_buy_panasonic_battery_cr1632.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/genetic_engineering_guidelines_ppt.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_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 5496 bytes
SHA-256: af8e78d85d63d58b5e15a00c12dcf39acfbe315a0f9be76d44f2428790dd70ad
font_01_sfnt_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 10532 bytes
SHA-256: 261632277078bf3fb1b66104ab3b43cac7bcb1d3b4cc46dbfa12684f1ce942c2

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