Malicious PDF — malware analysis report

Static analysis result for SHA-256 f321df593f8cc121…

MALICIOUS

PDF

87.2 KB Created: 2021-03-20 12:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8f4d0f27585cfe93007eec1d18f93fac SHA-1: 62da0ac902097de62f43e4fbcac4b895e6c65b43 SHA-256: f321df593f8cc121cbcd3bdb1a9e3505caec9c111cc92aba71606a005a1f4c22
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating it functions as a link farm hosted on disposable domains. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, possibly for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://kuzutuzo.ru/wix?keyword=finding+trigonometric+ratios+worksheet+answer+key PDF link annotation
    • http://blue-tick-central.com/46122307571asdd4.pdfIn PDF document text
    • https://bexejasofipa.weebly.com/uploads/1/3/1/3/131397997/vodomidalenuluf.pdfIn PDF document text
    • http://sonoxusa.iblogger.org/candy_crush_saga_hack_2019_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/lhjifha/download_castle_miner_z_xbox_360_completo.pdfIn PDF document text
    • http://vipmanmarket.space/66981682162tek8t.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/xLhiidw/camera_app_for_iphone_11_pro.pdfIn PDF document text
    • https://mavoxigomag.weebly.com/uploads/1/3/4/0/134096713/68b4d.pdfIn PDF document text
    • http://copyrighytsupport.com/power_acoustik_pd-931nb_9.3kz88h.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/305840673f767.pdfIn PDF document text
    • https://dopovebo.weebly.com/uploads/1/3/4/4/134431975/1334874.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/8f537467-136c-49a3-b61d-94c7228ab7d4/59572043922.pdfIn PDF document text
    • http://ruvoluze.rf.gd/sivuxajutiponaderavedixun.pdfIn PDF document text
    • http://tafikepuvanotu.epizy.com/taratozupibexogotonogiwam.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_b49fbdd6e4c347309d50a8c69fd49b42.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_98b1cd0d8bdc48f888932284e85fb855.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_01524cc394264b368cc13f32ff716b62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/632788fc-40a0-45d7-bae8-173a90e7e054/how_to_read_a_note_in_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1431393-4f68-42a9-9352-95d93fc39710/the_collector_2009_filmweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9053d9-3133-4ca0-be7d-ccc99a5dec3d/mercruiser_5.0_mpi_manifolds_and_risers.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_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 5532 bytes
SHA-256: f7cffa602b3ef008884e36e9a1ad896d6abb49a38027ce233a9f4c4794a4eb00
font_01_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 12016 bytes
SHA-256: 14a13b4ae3fe3a51e5e2cc6737c2bfc336b1aafbd967853616ac7d81a21635b0
font_02_sfnt_off00013992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 16240 bytes
SHA-256: 281214d1119d96f3a8ebe36682ff3c94e77595198e0ed7d049f81fad77dcdf11