Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6416523ffd3179…

MALICIOUS

PDF

70.5 KB Created: 2021-04-06 19:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8c481e9df68e410ea619c3e9f434254d SHA-1: da4d51e9223d6ee76dd1dbe21422568b9bcb36a3 SHA-256: db6416523ffd3179fe729f7008686fbdf035be60e47267cf4570fd0eec954f69
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier, indicating it is likely a phishing or malware distribution vehicle. The document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 5

  • 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
  • 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://bologen.ru/strik?utm_term=dr+ernest+holmes+quotes PDF link annotation
    • http://fuvelude.22web.org/tejefesezosulefitukutiwij.pdfIn PDF document text
    • http://new-leggins.site/nts_kp_tevta_application_form_20191qbwk.pdfIn PDF document text
    • http://blockingscenery.com/92039437031af26y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_6059b52fd5da6.pdfIn PDF document text
    • http://russianpatentexpert.com/490948503035qpwm.pdfIn PDF document text
    • http://anrostore.ru/dangote_sugar_annual_report_201308tdf.pdfIn PDF document text
    • http://repochka.site/example_biology_lab_reportegazs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_606c7f807cbc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_6655625139a34c2fa2ce2323239968e1.pdf?index=trueIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_03dda17202a4470f88eb0df8a1a35d0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resisuna/50414866813.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/vukosiworezadosuk.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_68325fce9dc74b599623a2ded8e00482.pdf?index=trueIn PDF document text
    • http://jegafat.rf.gd/maytag_bravos_xl_error_codes_e2_f6.pdfIn PDF document text
    • http://birijigasexow.epizy.com/73638218011.pdfIn PDF document text
    • http://fopuzotetowux.rf.gd/forme_di_campanilismo.pdfIn PDF document text
    • http://dinotowiteve.rf.gd/2633176126.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/premiere_pro_14.0.1_download_mac.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_9699a79fee8749ac9dcbe6756fc36725.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_9eb37f8290344d1e8ba3b95d258ea41f.pdf?index=trueIn PDF document text
    • https://9fd063f5-a6e2-47f0-a1c8-15c646e36cc9.filesusr.com/ugd/ee11ea_c96cdec7c50b45bb92e31e2ce52d2b7e.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_fb93dee8cd1e4d15a21beff57b1933db.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 4840 bytes
SHA-256: 5d785c5457dc51a25f461c88731541be1453c7ce6f2f31952881f852dcfbd972

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