Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95f9e46a1d4e848…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 23:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 155f1256e21ad4f90b50a4e60eea1d01 SHA-1: 75ee4018eef54684cf400fcf9467e5bc4e3d1652 SHA-256: b95f9e46a1d4e8480f4123955c74829ab7b7b4fb6ebc80136a1126182d1d5660
184 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier flagging suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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://soxebez.ru/award?keyword=ignou+b.+ed+prospectus+2020+pdf PDF link annotation
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/napopezilavusexepa.pdfIn PDF document text
    • https://zurokexotuv.weebly.com/uploads/1/3/1/3/131384071/650c6cf1a0.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/Pssjhd3/golf_on_mars_spin.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/woxofuvok_dizadifolemoxit.pdfIn PDF document text
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/gakapofo_wopego.pdfIn PDF document text
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/gewuwikotalikax.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/DificF7/sinif.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/8b90c866-242f-4d00-bc80-3a1316b42dca/samsung_galaxy_s6_user_agent.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_32802a9ba36a48898ee99bd9e7a599d3.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_080750779f324730978982740ae4c621.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_39f699bcb01442fcb4723f3db016d52b.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_f390125a3dc549b3b3ce34d12e3f4897.pdf?index=trueIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_3cff17f313ee4b4c9d160a2f61cbe537.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_3332627e4fdb4d44921d7c015718da96.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_ae5b5600430d41b59f959a72ecb10bc5.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_129a0cc4a3de4e68bcb0089f497d33ef.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_da488ce7a9064d50855493d62a4bf22c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/149daba5-62f0-40a0-85f6-78907214a8f6/pafofetuketumazidajamora.pdfIn 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_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 5464 bytes
SHA-256: 3c2e43dccfcb6312102e88466686107350b85a6c1c61699862402550d4a87532

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