Malicious PDF — malware analysis report

Static analysis result for SHA-256 58573ed031ddef6d…

MALICIOUS

PDF

89.0 KB Created: 2021-04-06 08:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 111cb1551d51384125329d1630b6145d SHA-1: 1af734e9a37e9704b00df5f92a275860db21a05f SHA-256: 58573ed031ddef6d47e730e72171feefc130ec05364e8e537240eda26c1be42d
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM support the conclusion that this document is designed to redirect users to potentially malicious or unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=farheen+name+status PDF link annotation
    • http://flash-sar.online/stock_market_trading_rules_50_golden_strategies3yq4t.pdfIn PDF document text
    • http://aduo5.online/three_body_problem_book_review7xd4v.pdfIn PDF document text
    • http://getveran.site/xupalujetinivujodusifezb7dmc.pdfIn PDF document text
    • https://jafoxoxuxovawe.weebly.com/uploads/1/3/0/8/130813536/7931112.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/b4e2d5fd08ff.pdfIn PDF document text
    • http://segway-wheelchair.ru/683542273943xald.pdfIn PDF document text
    • http://reactivascotia2020.com/xewuwujofcehd.pdfIn PDF document text
    • http://shmelev.pro/27445502156304p1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nojekakanafigi.rf.gd/tebemezorod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c966f5-58dd-4b1c-aeb3-b93443b68ee9/the_complete_book_of_hymns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6830ae0c-7061-46b4-b806-70326a773378/50116701572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6760800-8b34-4cff-9bf3-b2d315d6a136/30009279722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5af6777-be8d-417b-8386-930bc4c3b959/american_army_ranks_and_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22276c27-5471-4334-955c-3dc8af0039aa/crochet_instructions_left_handers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b992494-6fbc-4885-88f8-285c6984f4cd/2275188464.pdfIn PDF document text
    • http://zilozatajixite.rf.gd/xakuxabudokewutev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cc734e-7395-4dd1-888c-3c89d3a8d3b6/volaxuxofimavumemomev.pdfIn PDF document text
    • http://dalotatafajadad.epizy.com/birapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a25d519-4c9f-4416-aa8f-e3db652ae43c/starting_out_with_c_early_objects_ninth_edition.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_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 4848 bytes
SHA-256: b8917d766dfe8d8b79b4a0656069476bca5808e315544e44dd92a3a50a9eaa50
font_01_sfnt_off0001349c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349C 10220 bytes
SHA-256: 4959cc6fb585da804f10c19f6f85de5ada323599d2f916db61658551995bfb24