Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f5ef1a695a74fc…

MALICIOUS

PDF

100.2 KB Created: 2021-03-17 04:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2a7e34d98e4dfdf222fdcbe00014dd45 SHA-1: 5900c00f61a217fc3a3e2d3a78da3cfd45427d87 SHA-256: 23f5ef1a695a74fce520eeaebc5940646cc646b0bf00c5a0639a3780b2bd4044
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards the use of embedded JavaScript for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wix?keyword=tera+warrior+level+65+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407303/normal_602589de35c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_602ff0e98023c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_6014714b755a5.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/71a4d3408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453098/normal_5fdfc600a6414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_5fdbbcefc764e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_601703436ad5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_6031ec19853d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_604e44548f567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_60223ecfe7de2.pdfIn PDF document text
    • http://zuwujamoruwipam.22web.org/deagle_report_2025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482854/normal_5ff19aacc97ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5fd06e31ad3e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_601dd2296c745.pdfIn PDF document text
    • https://levonosaxedose.weebly.com/uploads/1/3/2/6/132695543/6088934.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/e18f6a5a-0923-4a04-ab2e-ddf26d31d7d2/nojowux.pdfIn PDF document text
    • http://siwofemevap.epizy.com/bheema_song_tamil.pdfIn PDF document text
    • http://rumavajusugeg.rf.gd/78263412270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93863ae0-3af5-4651-a937-9a1ecbffbd07/xuvemuv.pdfIn PDF document text
    • http://walepoxaz.rf.gd/bash_script_standard_in_1_syntax_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76059629-76ff-4a3c-a4e9-c59c82ce4080/xedidobedodimiwowamidoxu.pdfIn PDF document text
    • http://kojixaberi.rf.gd/what_does_subservient_mean_in_the_bible.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_off00014c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C11 5192 bytes
SHA-256: 8859f44d6911eb86beafd4ed1996af0a960605715dcbdeeadbb28bbc0dfbb17c
font_01_sfnt_off00015de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE7 11060 bytes
SHA-256: a2b6cb061f659c46779caabb292156f49a799e02aad3576e2a15e74e2cb52de2