Malicious PDF — malware analysis report

Static analysis result for SHA-256 51907d6d8ddee573…

MALICIOUS

PDF

127.1 KB Created: 2021-03-21 12:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 896d88a65bf78bfd1e5c09291c9840a2 SHA-1: bbed0a263ed83a8d01648e344768a40108a2234c SHA-256: 51907d6d8ddee5730f4c76b97e61359e05d370b1ffef3fe23ad8034857815a0f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://nipisod.ru/award?keyword=myocardial+infarction+pathology+pdf PDF link annotation
    • https://cdn.sqhk.co/xozawimepod/gigficH/41075962440.pdfIn PDF document text
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/budejixe-wawobugovilibe.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/d0bff6.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/waboz.pdfIn PDF document text
    • https://cdn.sqhk.co/nezosomoji/cLYvdhg/59079951930.pdfIn PDF document text
    • http://italylife.pro/mary_shelley_frankenstein_free_movie_onlinekjgkb.pdfIn PDF document text
    • http://kittyplay.online/kuwimubuwarekuduwetosdvvd8.pdfIn PDF document text
    • http://sunny-web.ru/cut_the_cake_lyrics_average_white_bandhbhn4.pdfIn PDF document text
    • http://zavifuvalo.22web.org/intervention_theory_and_method_a_behavioral_science_view.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/linop.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/IjjWhh3/easy_2_load_trailers.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/984501.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/1a38cc97-bdd0-4338-b6bf-0e16d1a99554/68815921721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b79e36-cba6-4e22-9b7e-28c8d710449c/how_much_is_a_transmission_for_a_ford_ranger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f6359c-0de0-4460-b677-50e137fca251/91598624519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fe2cd8-98ff-4cb0-bc2b-6937796744e8/batch_code_commands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af434635-0a3b-4567-a118-019fe7ce4880/fodazaritaxubamubeparup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36f9069-fcc5-48b0-94a9-5e9c94991dae/95808431744.pdfIn PDF document text
    • http://ninesunugata.epizy.com/8254423601.pdfIn PDF document text
    • http://tidukuj.epizy.com/dazexegubapokutowizixo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A02E 5348 bytes
SHA-256: 223ab9f3a62f520d96d52d2dc9355e0efefc32f34ea287c6fd51d96bd0434a89
font_01_sfnt_off0001b273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B273 11528 bytes
SHA-256: 6654b4b86e09318c42ba5cb5d0a2c44a1e2a7650e16c91d27e15b96611184f41
font_02_sfnt_off0001d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D930 16148 bytes
SHA-256: 98bbda09e34957c2c47eea570891e411fa41ced272e9777bbef021ce7395b75a