Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fb88c14bd949cb…

MALICIOUS

PDF

91.5 KB Created: 2021-05-03 06:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2b76fc4c462a615d92ed27a07c19fa08 SHA-1: 774b67edd76e7031e958bb1855eed413071574dd SHA-256: 28fb88c14bd949cbfb25a1434b443f45de7a8714fd2edd0fdb90b595eb5e06a4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to potentially malicious content. Heuristics and ClamAV detection strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure itself suggests it's designed to lure users to external sites.

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://dugedepap.ru/strik?utm_term=html+tag+table+column PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404969/normal_6007c4f8dcf7c.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/44500811403hv92d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_6016fc53708d5.pdfIn PDF document text
    • http://flymoney.net/mozepikiwwkwy9.pdfIn PDF document text
    • https://cdn.sqhk.co/zubafena/ieFii1Z/property_management_budget_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/IxrhiXa/racecraft_build_and_race_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5fd136245843d.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/3l60hfw/4626460437.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/2BUPTQO/5660596454.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/dBgcgg0/4485277240.pdfIn PDF document text
    • https://cdn.sqhk.co/gumakulex/hhrsQdj/neighborhood_market_walmart_pittsburg_ks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_ff7bcba3efd24ae298dc81c26a203957.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e020d7cc-ea80-4283-b54f-3edd3799fe90/27003295192.pdfIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_d37438963a7043b0829f5ccea65cab52.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_b1826524c31f4763b738d5c5dc2afef0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8dd759-a78c-40c9-99b0-95ac9d5059b1/susodanopumazojudogonodom.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_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 4948 bytes
SHA-256: 2fde78b0b95f5f95ba854fcc424ea308c2c845b49d9add4f38c3db24997cd7e2
font_01_sfnt_off000137c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C4 12136 bytes
SHA-256: ab0c609fb846d98d35cfcfd532719987116095dd0cc4b7836e5b6c1fd4e4c777

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