Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f521553845bce05…

MALICIOUS

PDF

115.0 KB Created: 2021-03-25 00:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9c8f36a0d6883af4eedaa760f8d1cc16 SHA-1: 3391eb3e28a95da61a7d441b92d26bbb354d01af SHA-256: 4f521553845bce0593b45c2862ef229bf31503e9430883466e2696f3471149e4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful 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://ponafet.ru/wix?keyword=13.2+gr+the+genetic+code+answers PDF link annotation
    • http://gakagebir.mypressonline.com/banuxozovuzaziwutag.pdfIn PDF document text
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/1538013.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/wubigama.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/dapami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_084760cef95e43c8981368747741a211.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/338eb9c9-36ca-48bd-ae10-9dace9be04cd/93598093910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3c1403-8790-4229-8cb3-bf06d3b2297a/jitoz.pdfIn PDF document text
    • http://sabulawum.rf.gd/grade_6_maths_worksheets_with_answers.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_390ea28dbf2c4e24ad72783814ae4c7d.pdf?index=trueIn PDF document text
    • http://kojenixerog.myartsonline.com/65221026714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be494eb2-b759-4b41-b918-c189002438eb/how_to_connect_ilive_bluetooth_speaker_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db63c433-b669-4b3b-bd09-9b94a4ea6966/24234287050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7486c692-04cf-4f26-93ef-e2f461c7c432/83281853604.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_37679a5639e0404f895d142f924d72c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d445b911-b6a6-4af1-9e55-6f381c6ff548/84133127306.pdfIn PDF document text
    • http://bewaxupu.rf.gd/gozozor.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_0bd7f82a3f484ba2ae6e7d568af1c6c5.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_b730f72d54fc49cfb4b2bf4453ecb507.pdf?index=trueIn 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_off000181a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A0 5544 bytes
SHA-256: 109086ce06b480216e40499401b4117d8e24bde8f75c1508b314a396b88ac700
font_01_sfnt_off0001948a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1948A 12988 bytes
SHA-256: c85ca4a786443a94785150a674c5635f69aa821a7beb467e4b21315cbbca22be