Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86859a799ebfb6c…

MALICIOUS

PDF

96.8 KB Created: 2021-04-03 11:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5ef4d7383d390e2b72d32068b1941181 SHA-1: 47af285201cc5a13f66453f9c03f16d630e64b69 SHA-256: a86859a799ebfb6cba0137006957c7299de4639a087fb4e6f38f2c97a0f4325f
242 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains a large number of embedded links pointing to external PDF documents hosted on various domains, many of which are identified as disposable or potentially malicious. The heuristic firings indicate this is a link farm designed for SEO manipulation or to distribute malware. The ClamAV detection and ML classifier further support its malicious nature, suggesting it may exploit vulnerabilities or lead to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8333

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=tibetan+buddhist+mantras+pdf In PDF document text
    • http://grenkasalo4.xyz/897934000647roqp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fcbac92227ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_603ddf1bee639.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/blhdghF/toca_builders_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5fe82f4455fa8.pdfIn PDF document text
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/5e16fefc19fab77.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/jjieMmp/free_student_attendance_tracker_app.pdfIn PDF document text
    • http://all-casino.xyz/prevent_form_submit_on_button_click6gwv6.pdfIn PDF document text
    • https://mufusudakewita.weebly.com/uploads/1/3/2/6/132681672/wasusobasitix-jozodebumewadi-rinegirub-guwitagib.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/ahijhLk/final_heroes_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_60400bd40a4f2.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/zoladuj_lizixazipilazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_58bb8f87602b45b680b86d73a5adb4d8.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_e5ce04ee5036431faf9023c2a8d2355c.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_9c9f068438ad4002bac5520c8c30c9e7.pdf?index=trueIn PDF document text
    • http://zefinut.rf.gd/19475608020.pdfIn PDF document text
    • http://wikatamuk.rf.gd/scrivener_3_android.pdfIn PDF document text
    • http://povemuxituziv.epizy.com/wukeraxuzip.pdfIn PDF document text
    • http://dapizifotokom.epizy.com/4548492814.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_dc77419b1b84440c8d86178d0265c771.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_e73072097b08425cb7cc7090033ada45.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14427 9088 bytes
SHA-256: 8400bfcb5a916dee3e8b92dd83527e1a658d7eca470406a997b7ea120c255146
font_01_sfnt_off000162b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B8 5108 bytes
SHA-256: b66de0ed902e18245a724560d53716e8e0bedda6015cf6b5309b4bb161ad9462
font_02_sfnt_off000173cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173CD 4472 bytes
SHA-256: 9123a1c4da111a845aa5fa8204a969b8e324c5c5105770c66282dcacc97015c8

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