Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff2159eba707800…

MALICIOUS

PDF

77.9 KB Created: 2021-04-16 14:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 78c93df2bfc61f628ede1735309f89f3 SHA-1: 5942a411e50d00247f20ff012bbc07910ce693d2 SHA-256: bff2159eba70780078e468f9281b25c3220822cb262169e11f41b86453c1b738
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, https://vilenefex.ru/strik?utm_term=swann+thermal+sensing+security+system+manual, appears to be a primary lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=swann+thermal+sensing+security+system+manual PDF link annotation
    • http://bigpleasure.ru/radhe_radhe_bhajan_mr_jatt8a15h.pdfIn PDF document text
    • http://mavogevuz.getenjoyment.net/52139823817.pdfIn PDF document text
    • http://alisabor.design/nagilinisilerufiriqq6a0.pdfIn PDF document text
    • http://gouliwer.online/benim_hocam_kpss_tarih_soru_bankashisw8.pdfIn PDF document text
    • http://nigasheff.xyz/tent_card_calendar_templatei65ge.pdfIn PDF document text
    • http://znakomstva69.space/motalelepeguja72lz2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_c8cfbb08d42a42b88e5d8713fc65ae90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosevud/how_to_replace_ge_water_filter_head.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/daban.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_a50ff1a3c37f48a78e2acdd884cc810c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/cooking_level_guide_bdo.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_0b14a445ff174d319aacaf53b5dfa073.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_508cec3a44e44ca69012630e25641d4a.pdf?index=trueIn PDF document text
    • http://kojuvurapamox.myartsonline.com/lok_sabha_election_results_2020_list.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_ff6a9b6104704e4b88a27e422e7a9d6d.pdf?index=trueIn PDF document text
    • https://f7804d76-b933-424a-9ce6-c19a64096e1c.filesusr.com/ugd/e3c460_8b056188cff5483aaa9c12ec8256c2cc.pdf?index=trueIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_660640392c464490810fdefa06f67085.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_25d2b27ab7ce47c99c256e504d2e11f8.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_4f3a26e1daaf4399b64c9f340d9f093e.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_c27ec2be265646e9a220269fdfad1241.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 5512 bytes
SHA-256: a21118e6db45ab6e36a708aca245ec645cf179dc1f79d362f02eec1af737bc7a
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 10780 bytes
SHA-256: b99b080c78b270f3e0f5f51156186e1a5aa40135604ddb9b06a71ff789995dd9