Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf50d9a21a609122…

MALICIOUS

PDF

87.9 KB Created: 2021-06-12 06:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8cc84b4d305f4fac4ec2acc7489d96ed SHA-1: 5081d1db2e3ff60cdb3b4eea8e10d5d03b6d67f8 SHA-256: cf50d9a21a6091229a617bb50b84327aeb35a7bd3a821545431eb38d7968d526
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 pointing to disposable hosting, indicating a link farm designed for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/pbw?utm_term=projectile+motion+worksheet+answers PDF link annotation
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/6060152.pdfIn PDF document text
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/d015530e062.pdfIn PDF document text
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/2099951.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/xizudomozulogoraver.pdfIn PDF document text
    • https://ninofupefuf.weebly.com/uploads/1/3/1/8/131856131/serav.pdfIn PDF document text
    • https://werobipopopavuv.weebly.com/uploads/1/3/1/1/131163729/3097594.pdfIn PDF document text
    • https://lutenowunag.weebly.com/uploads/1/3/4/6/134627800/dapoburos-wejunexurinim.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/nibepujomipozi_darewal_gijuludeb_tojobabubosapol.pdfIn PDF document text
    • https://juwavade.weebly.com/uploads/1/3/4/5/134526694/6759621.pdfIn PDF document text
    • https://vunatoja.weebly.com/uploads/1/3/0/7/130738644/5847957.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/8865e4cf-9e09-456e-8730-4c278b432c3b/how_do_you_know_if_something_is_two_tailed_or_one_tailed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c612369a-1f79-459f-a13f-6f274887239a/mirugapaxapimumupubib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ad10f0-3cdd-4962-a53d-8ca09c8bbcd6/berekomusidipaxopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995c621d-0ad3-4310-90bc-5c0be7c77c99/kowenododupovopew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a79361-f568-4e9a-92d0-3c2e9c0bf92d/what_does_snuggle_bunny_mean_in_slang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf5f572-6ef3-44e0-b250-80e777f4551e/42336352259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c45e774-cc77-4d16-9c63-b40589cc3f60/the_rule_of_three_book_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d096f2ac-eec5-475a-8dcb-3d3bac2bf7f0/dodedituvafajejad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72669cd6-3332-4967-ae1d-1af9b7a31804/how_to_scan_a_document_from_hp_officejet_4500_to_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfef0f8-8803-4478-ab6d-2ed7ed2c403e/bemolaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa89a30-261f-45a7-a4fa-1fbcaae50e7d/xaxifowolizuvisubeg.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_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 5272 bytes
SHA-256: 1473cc4111ff0491b958b29241d0464923aaa617f78c8df1c3efaf2e9bef1741
font_01_sfnt_off000115d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D2 11120 bytes
SHA-256: de81fa3de2d5449fe4de4835c0ac6d2435b14e3f79a3ad22fbdd4e28b832011f
font_02_sfnt_off00013c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 16152 bytes
SHA-256: 70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e