Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcca9d5d715666e7…

MALICIOUS

PDF

79.0 KB Created: 2021-03-04 00:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9f7859bc90eca53a1cd5608843e155bb SHA-1: d6b3ccdda99c3791d68f0f1b09ee1f801701501c SHA-256: fcca9d5d715666e7bf007f118fb3ac0ae0e3161cbde8e09510e21694f452ffea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('vilenefex.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a search query, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=what+does+fluency+mean+in+math PDF link annotation
    • https://modevidiwuwos.weebly.com/uploads/1/3/5/3/135318048/temamilizanitoj_debagugixiko.pdfIn PDF document text
    • http://kopolade.22web.org/48816828523.pdfIn PDF document text
    • http://mibemuxagegija.mywebcommunity.org/sadazodovesawetivikosopa.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/jhd3Aih/15104552434.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/make_it_stick_the_science_of_successful_learning_free.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/eRthha9/79680612586.pdfIn PDF document text
    • http://wavolat.iblogger.org/2d_affine_transformation_matrix.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/hagfgio/pixel_unknown_battle_royale.pdfIn PDF document text
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/xarizimak-tixegitabi-pawet-jilugikufo.pdfIn PDF document text
    • https://mujilaku.weebly.com/uploads/1/3/4/3/134389228/xapifutaro-ximemexapu-nizojitevinefot-seligu.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/sajas.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
    • http://bodegifu.atwebpages.com/xiruturodobonix.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/walmart_albert_pike_hot_springs_ar.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/62915822983.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 5164 bytes
SHA-256: 2eedd18ee7a6604ba3f2393661c500a59b361cedea8a6fd62bd1e26d2792570a
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 10704 bytes
SHA-256: d47dde586d4751ddaa83686fef2785d013988259bbb546b911df7ab6c80f8b05
font_02_sfnt_off0001261e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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