Malicious PDF — malware analysis report

Static analysis result for SHA-256 8378896c8789bbc7…

MALICIOUS

PDF

80.0 KB Created: 2021-04-12 08:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 06fcd72f47b714b416cd6dfabed92921 SHA-1: 732a038059a0924cdbeda39d13a4200253e6355a SHA-256: 8378896c8789bbc7f6bf32c56a6ca9e440609990ea535628818d06768ac78e25
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains keywords related to hardware components, likely serving as a lure to attract users searching for such items. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=dell+optiplex+9010+power+supply+price PDF link annotation
    • https://vevuwameran.weebly.com/uploads/1/3/0/9/130969214/gumefaraputepowoxi.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/solusomoxixolopawaz.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/a4a9a.pdfIn PDF document text
    • https://nukarefu.weebly.com/uploads/1/3/4/1/134131348/sabetuvugo_wukukap_pamakusol.pdfIn PDF document text
    • https://genopajixon.weebly.com/uploads/1/3/1/4/131452954/6973689.pdfIn PDF document text
    • http://judupebe.getenjoyment.net/pomaregemawoxen.pdfIn PDF document text
    • http://newutatokulu.getenjoyment.net/45205728614.pdfIn PDF document text
    • https://gabukoxikala.weebly.com/uploads/1/3/3/9/133997771/lubebebabaruf-borape-tifaworuzurozi-fobovu.pdfIn PDF document text
    • https://jovopunok.weebly.com/uploads/1/3/4/8/134869647/499977.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/1157093.pdfIn PDF document text
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/b58713.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/pusoramago-nagugepewutosiz-roxozarema.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/0f967730-203d-46db-beae-83e5e46ec122/how_often_should_you_add_wood_chips_to_a_masterbuilt_electric_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436b0e4c-fd95-4133-a79e-a69d43bfc31f/mejepawa.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/guzunotukamaparutizik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9236a503-3864-4e6f-b0db-e15b6dec99f5/79898456063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724de4d6-b295-4908-9a13-74d0f4dfde8f/what_is_the_best_strategy_for_daily_trading.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/what_is_the_next_book_series_after_trials_of_apollo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c141adfb-e7a2-4f6f-bd15-b19fe0313454/algebra_and_trigonometry_with_analytic_geometry_12th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b981cfa-73c5-4a18-a802-b7eed8c37eee/biomedical_engineering_unsw_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7923fc33-df29-4e66-9687-3836a5d4e84a/32850663373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd86ff65-914c-4b4e-8d30-534d5ec3a523/kezulinegorafikenikel.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 5328 bytes
SHA-256: 2f476d56cae64cdfe6164b455fecd060bc2fd50f467a87a94feb02f472e36952
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 11748 bytes
SHA-256: a8bd0eb0c303ee1e3fb4d8043b6a8c05762bc6292d6dd4df78b85df54c21662a