Malicious PDF — malware analysis report

Static analysis result for SHA-256 71268d613228bef0…

MALICIOUS

PDF

81.8 KB Created: 2021-03-19 03:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cb483fc0e5929c4ba600640ef19b1c5e SHA-1: ee08b99038a952e91817c3121b95e74fd72d5658 SHA-256: 71268d613228bef04489563558f8dd52f72a772c8d3b04c3f79e3504cf2e0e4b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/aws?utm_term=causas+de+trombosis+venosa+cerebral PDF link annotation
    • https://cdn.sqhk.co/badaxiloru/xtiarjd/amazon_driver_jobs_akron_ohio.pdfIn PDF document text
    • http://frankiearvelo.com/toolwiz_photos_pro_editor_for_pcbvi9p.pdfIn PDF document text
    • http://paradusafe.iblogger.org/94074602684.pdfIn PDF document text
    • https://sadaxolofomet.weebly.com/uploads/1/3/1/4/131453623/jemafer_vatejaledoxipup_xosoxutab.pdfIn PDF document text
    • https://vewosofi.weebly.com/uploads/1/3/4/4/134493368/4451832.pdfIn PDF document text
    • https://notovozeje.weebly.com/uploads/1/3/1/3/131379031/2a55b8a38.pdfIn PDF document text
    • http://pe50off.pro/how_to_change_the_code_on_a_supra_key_boxu9o45.pdfIn PDF document text
    • https://jugoneworo.weebly.com/uploads/1/3/4/3/134307205/pasema_xuwexuxugako_pabumak.pdfIn PDF document text
    • https://niwonuruvi.weebly.com/uploads/1/3/4/7/134767359/937469.pdfIn PDF document text
    • http://vanibunogi.iblogger.org/sarojuvasa.pdfIn PDF document text
    • https://kuduvoga.weebly.com/uploads/1/3/4/7/134745106/wosekem_neparu_vupaku.pdfIn PDF document text
    • http://true-board1.club/linifutavxx29.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/avogadro_s_law_problems_and_solutions.pdfIn PDF document text
    • https://tamusibexo.weebly.com/uploads/1/3/5/9/135966636/7977093.pdfIn PDF document text
    • http://logmeinnow.xyz/vocabulary_words_for_cattft0s.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/ZmceChc/vejogetod.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/gigalizus.pdfIn PDF document text
    • https://namebobave.weebly.com/uploads/1/3/0/7/130739452/4647724.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/gWtjrYI/ice_climbers_game_boy.pdfIn PDF document text
    • http://laxelenokuro.22web.org/nfl_schedule_week_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujugefov.rf.gd/avira_vpn_full_crack.pdfIn PDF document text
    • http://vekabun.myartsonline.com/varicocele_tecnica_quirurgica.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_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 5192 bytes
SHA-256: a239e30ec6d6f1a6bfc95f8186d40c0ee8786d434b09abc4a2bf3b1fafecc2ca
font_01_sfnt_off00011314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 12348 bytes
SHA-256: b5156603e7b2bca170f4e279c616cabcbc602b7682fd056ad0f1f255044e28e3

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