Malicious PDF — malware analysis report

Static analysis result for SHA-256 f281add59e4f792e…

MALICIOUS

PDF

95.3 KB Created: 2021-03-31 14:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: afde5dc6c5f2a6a8ca2eca830e131eae SHA-1: 946da03da67dbd1da99d80d6ff8e1fab965e35c2 SHA-256: f281add59e4f792e10fee4832cc0075940c2811388e8ba81b544996e22f1c319
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the PDF structure itself is designed to lead users to external resources.

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://jumiwimov.ru/award?keyword=amaurosis+fugaz+causas+pdf PDF link annotation
    • http://vugekowuzujed.scienceontheweb.net/62031169079.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/hV3jfOz/red_and_blue_jordan_1_fearless.pdfIn PDF document text
    • http://supernefritroller.xyz/nutemexotieqjce.pdfIn PDF document text
    • http://lulizukudomiz.scienceontheweb.net/candle_patterns_forex.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/goveja-vuvovefogu-nulogexebit.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn.sqhk.co/falugojafat/dhfgRib/multiple_photo_blender_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/7lhfygj/deremekadobal.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/gaderabefalutamu.pdfIn PDF document text
    • https://cdn.sqhk.co/wapuvalapowa/dejgPjb/criterion_collection_blu_ray_template.pdfIn PDF document text
    • http://copyright-helps-team.com/harry_potter_and_the_order_of_the_phoenix_game_mac_downloadzk9p0.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/ijieZ5l/96766415864.pdfIn PDF document text
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/0a61c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/michael_vey_book_4.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_c7cc79ffbab4477283e962032f4b45ff.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/resonant_circuit_oscillator.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_9b01b86cc47946b3809215d77d691c4a.pdf?index=trueIn PDF document text
    • http://dotopaku.atwebpages.com/45687101996.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_off000131e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E1 5484 bytes
SHA-256: 1856fb04ea9db8845528e9e090ab1ba394b2f2ec4f61f180a72a3bb76fddaa43
font_01_sfnt_off0001447a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447A 12856 bytes
SHA-256: d5a72dc31a137b53cfe8e1e0cc4e5aa90ab4ec286f68fd7e9e3e3ffdb7ed63d4

Open this report in the interactive analyzer, or submit your own file for analysis.