Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1d3085adeb6d08…

MALICIOUS

PDF

90.3 KB Created: 2021-03-14 03:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8e779a556dd6e044d668ef2d6998c00b SHA-1: ed1484a50d842b5767557006cd21b9cec078e59c SHA-256: 4a1d3085adeb6d08bf153c3e2f2bbcb4a1a5803a68ec24999f19960a34525041
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, pelibifir.ru, which is likely intended to host a phishing or malware distribution page. The document body, though heavily obfuscated, appears to contain metadata related to its generation, including the wkhtmltopdf application, and a search term, suggesting a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=naruto+volume+11 PDF link annotation
    • http://sevezor.scienceontheweb.net/christmas_carol_sheet_music_printable_free.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/progressive_tense_exercises_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_604ac990771fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5fddc147e8381.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/93956377870.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/sufep.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/jevikipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fe994c81369d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/54bcedc4-a7f1-4e64-8206-29eb2178a487/the_man_in_the_high_castle_ending_quora.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/32848142447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20a8839-bba1-44da-9ff0-5b057475720c/romeo_and_juliet_act_1_scene_6_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/ninja_blender_costco_uk.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_f1b8c447c0084ad38517acacfdc1d3f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/797621a0-0ae5-4f6d-94e2-e4e365e6e385/northern_ireland_postcode_format.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/gavitoza.pdfIn PDF document text
    • https://3228dc58-b2c1-4aed-ac20-03fc52793822.filesusr.com/ugd/43afbb_3040dc1a0a3b4364851a99eed3163d8f.pdf?index=trueIn PDF document text
    • http://jadivepijuga.myartsonline.com/solid_converter_to_word_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f6f2b4-2db3-47b5-994f-ac21dead531e/xojasiwovelot.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/5215728795.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/car_value_guide_nrma.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/tikemejudunalilutetere.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_632294dd691047959b7a6ee7fb8ddbc0.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_603bc93b9fe144b0a3f5c7437b623674.pdf?index=trueIn 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_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 15152 bytes
SHA-256: ab940534c3336936a4b922834e102842c41398cbcc580689b42f508850511af7
font_01_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 4736 bytes
SHA-256: a1c9acecfedddc8b1482485bd0c54b52a5b0d734acc54621b09acf2df1eae6f4
font_02_sfnt_off000135a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 10884 bytes
SHA-256: 3ba08852a6a8c2b1074a906da92198a37b3275861a46a911bc539f4c92643c35