Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b1fa95f27889e7…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 08:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4a081e13b031dbe02b1078c75055be74 SHA-1: 77e7f5a82a230ad81e436ef2540cf08f2bf909e4 SHA-256: d9b1fa95f27889e73a1b26ccdf8c930404dc0a9682702f2a4d865ed3a1c5ecdf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farm and phishing schemes. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links, many hosted on disposable domains, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support the malicious verdict. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=swan+lake+theme+piano+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5fd14963356b1.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/fitness_quest_gazelle_edge_replacement_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_604adbeaa448d.pdfIn PDF document text
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/6b62fc10e.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/how_to_prepare_meals_for_the_week.pdfIn PDF document text
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/f68d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_605a15ab61b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5fd862f8263e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_60332cf9367a1.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/the_secret_life_of_bees_full_movie_free_online_123movies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_5fe8a3de59080.pdfIn PDF document text
    • https://bofakodejo.weebly.com/uploads/1/3/4/2/134265658/6361406.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/xepuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489422/normal_6023848125271.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/87604685367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_601c6a9ae8fb7.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/dunisapukogalajune.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/physical_science_grade_12_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/bakuvenavobidopetejivu.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/1fb6a29f-4fad-4411-ae33-3fdae0ef8aee/how_to_clean_hp_7520_printhead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e424a1e9-2fd4-4680-a9a6-902e65be7d7e/fobaravinovobabimupanisi.pdfIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/najara.pdfIn PDF document text
    • http://zuputes.atwebpages.com/clicks_catalogue_august_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430892d4-0fbf-4df6-80e2-2b73aac54cc6/wuvunixoxuxasotano.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_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 5444 bytes
SHA-256: 85257c3f4032e905662ce19689f2966589abe2136bc1e7edc4f708469587af26
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 11680 bytes
SHA-256: a052bbafc633d42da421541835a34719f8c619bb97e0db7eb5eec55686ca2703