Malicious PDF — malware analysis report

Static analysis result for SHA-256 553792886fddbffd…

MALICIOUS

PDF

91.4 KB Created: 2021-03-19 08:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d1091d34ddbed08a4bd8250bbb3d5478 SHA-1: 22b4db0172f015cb50d49b7c95e2690b702253c1 SHA-256: 553792886fddbffd59c25ec758e5d66173d1851e0181c40e438c346892be81d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting pointing to 'nipisod.ru'. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=wonder+weeks+leap+1+not+sleeping PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495265/normal_5ff9e247d210f.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/ccna_cyber_ops_secfnd_210_250_download.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/quote_from_ralph_waldo_emerson.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fcbec6f6930f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5fe50e53510c7.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/tongue_twister_words.pdfIn PDF document text
    • http://missunik.space/bdo_witch_combo_guide02say.pdfIn PDF document text
    • http://livecopyrightverification.com/93138821626i5sw9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_60146cddae7f4.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/dorero.pdfIn PDF document text
    • http://health2health.online/vipepo7vwlg.pdfIn PDF document text
    • http://itawegan.space/dunodore9xzfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5ff1b13080603.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/7aba1c85-7fca-4d7f-8237-4c8bf6da8ce7/nigajasagon.pdfIn PDF document text
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_a21575e58034487c9d9bfb9b1a271f58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/jovebofar.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_6a06a634c6514746819238f5ea1f2eb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3580be3-8752-4d5f-a865-e007839583bc/pathfinder_kingmaker_kingdom_management_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30656ae-f2c2-4421-a0e6-730c6846800d/what_are_the_mudras_in_yoga.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/50725229803.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_ab0fcc1dfd214276b6cae27ff50530c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/angry_birds_game_for_pc_softonic.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_786276435ca9409094ba99084b3d6102.pdf?index=trueIn PDF document text
    • http://pekiluji.atwebpages.com/web_design_and_development_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/panenugurokugabuniben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3428693a-bebd-4515-8725-f444f3ed35cc/uncovering_student_ideas_in_primary_science.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/blender_mobile_app.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_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 5136 bytes
SHA-256: 599901d59bd3cb120ba9569a62eae54755018aaeb2f77429f0ec4a615e8b849c
font_01_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 11424 bytes
SHA-256: 709293a2db4031c24de1aaaa17b3f3965d5d0a2b30260a3b093677d9241a9ce7
font_02_sfnt_off0001519b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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