Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cf673be3e93491…

MALICIOUS

PDF

83.0 KB Created: 2021-03-16 23:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f699f2e2c3b6231ad312a0616037fb2e SHA-1: a6c69bffa6bd71d2bfd1fe6955d09c7674d9a792 SHA-256: 58cf673be3e93491dbeed5cb187f7092aa810335d52a5471be3c16f6eb470a1e
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 domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or ad fraud. While no scripts were explicitly extracted, the PDF structure and external link behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://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://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_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 5464 bytes
SHA-256: 3c2e43dccfcb6312102e88466686107350b85a6c1c61699862402550d4a87532
font_01_sfnt_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 10988 bytes
SHA-256: c122259bebd02653e731315390904693ef4ca073fb29a9921b343205645d2b36