Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0143916e2a1e0d…

MALICIOUS

PDF

88.3 KB Created: 2021-03-29 19:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb268ce7407e90f9119b27228d387727 SHA-1: 1e4732a16774d3fca468815dd39be4b65c5b5c5f SHA-256: 3f0143916e2a1e0d02c2f407fc0796ed97fb69d55e9b829d0cffb77172124d7e
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=major+landforms+in+west+asia
    • http://mon-cmbretagne.best/luwede4kc5s.pdf
    • http://sun-italy.space/5022429947876l8a.pdf
    • http://mibikazut.mypressonline.com/rezofisifosowiwofobu.pdf
    • http://wipunemobak.mygamesonline.org/speed_queen_dryer_installation_instructions.pdf
    • https://static.s123-cdn-static.com/uploads/4417222/normal_5ff91b75742fb.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fe82e4aa209a.pdf
    • http://nitesufi.sportsontheweb.net/boston_celtics_schedule_2020_20.pdf
    • http://mamafiposorugul.sportsontheweb.net/28915695688.pdf
    • http://lerimofo.mywebcommunity.org/rrb_je_previous_year_question_paper_book_download.pdf
    • http://wonder-ita.fun/troy_bilt_riding_mower_blade_changew0z8a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_8d1308087e504301af2ecc29d9ecfd8a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd2a8927-03d9-4c45-aa2d-ac8965cbc8ee/sukorusoxuro.pdf
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_ce74f8771d6049aea1988ed188c512be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c90183cf-9b0a-4a49-b6e5-272c2bb5ee28/drop_baby_drop_song_lyrics.pdf
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_ab859cf027d846698b352eebc78772f0.pdf?index=true
    • http://sadoboxijowem.myartsonline.com/biochip_applications.pdf
    • https://uploads.strikinglycdn.com/files/d972bea4-401b-4de0-b378-9e23c7c787e5/soccer_training_tips_for_8_year_olds.pdf
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_1964ac03194c417fab3ebf13943c129a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011948.bin
45f39ae39dd6655563fa970b28720b80bcefc4d524b7685997e04097d8559570
pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 5224 bytes
font_01_sfnt_off00012b14.bin
173160740555fc05d3591614bffd1d051f5c176cfd7f91529c493570da3d441d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 11848 bytes