Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b2bd58a6f9dac1…

MALICIOUS

PDF

81.2 KB Created: 2021-04-03 11:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39f70507cfba3d834ccc436d06fce944 SHA-1: de3467aae78265844a00b2cbfc804855f4cd310b SHA-256: c1b2bd58a6f9dac1b0d3c49d165f950ea56fdfd8afc2bfdf1c6fbe1e29be1a23
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary one being to 'vilenefex.ru', suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, further supporting the malicious intent of directing users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URIs and the ML classifier's high confidence score point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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=papier+vente+voiture+pdf
    • https://cdn.sqhk.co/jozojonujaj/cY6ugc0/nalozivinunolaxanolimi.pdf
    • https://cdn-cms.f-static.net/uploads/4393901/normal_6061a6d3be349.pdf
    • https://cdn.sqhk.co/godidudawat/jI4lZVb/comedy_central_cancelled_shows_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4377113/normal_5febcfb712066.pdf
    • https://static.s123-cdn-static.com/uploads/4462688/normal_6009509f9e273.pdf
    • https://static.s123-cdn-static.com/uploads/4387929/normal_60019e30da222.pdf
    • https://cdn-cms.f-static.net/uploads/4479679/normal_60245ded7ccdc.pdf
    • https://cdn.sqhk.co/votojuxosaf/j4s8iaC/freedom_debt_relief_lawsuit.pdf
    • https://cdn.sqhk.co/xudapurofoz/itJjgZK/revuva.pdf
    • https://cdn.sqhk.co/pevotido/gg2gigg/juvojimikesorukupizuvus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nepopenezum.rf.gd/84009399966.pdf
    • https://s3.amazonaws.com/remuv/deltran_battery_tender_plus_manual.pdf
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_7c968e66f32746c3bcb77198e2bcebff.pdf?index=true
    • https://s3.amazonaws.com/rurosaveruk/exceptions_to_mendelian_genetics_worksheet_answer_key.pdf
    • http://sopenexu.epizy.com/music_notes_chart_for_guitar_neck.pdf
    • http://sumoxajavagal.rf.gd/20013852366.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_f8c2279562804469a491a8dd1812fb8e.pdf?index=true
    • http://gifonuva.epizy.com/pibirovasonefopeguziwage.pdf
    • https://s3.amazonaws.com/pajukovuxetu/what_is_another_word_for_question.pdf
    • https://s3.amazonaws.com/wezukep/maradona_malayalam_movie_480p.pdf
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_e97d7663e1ed4e43b86c69eb86de57e5.pdf?index=true
    • https://s3.amazonaws.com/padosumifubobo/ruruzewivi.pdf
    • https://s3.amazonaws.com/fikuvine/buribovabiliradawoxasavif.pdf
    • https://s3.amazonaws.com/dikobepibelun/vinonikajuxamerun.pdf
    • 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_off0000fd32.bin
ef04d064315f94b781d5bc9c52e3f6c86cac3ed6d8d4998f1dd4e79b5fd4c0fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 4888 bytes
font_01_sfnt_off00010def.bin
ec50b362e676f2f96d7f81c855ae6f413bca2124ff3218e51b76ee5c2a88c939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 12668 bytes

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