Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b891c93ba17d49…

MALICIOUS

PDF

79.0 KB Created: 2021-03-28 14:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8b84ca16918480b5b11f6493d772fe12 SHA-1: 6c88366a76925834580b509c6cc0bd3badc5993f SHA-256: d9b891c93ba17d49a3eadefb30eb54b24aa0cbe73f2b7db46fe330d42b7c09f6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9491

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://maypoin.ru/award?keyword=williams+haematology+pdf PDF link annotation
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/97c91707.pdfIn PDF document text
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/7792100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417414/normal_5ff7d4411b609.pdfIn PDF document text
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/tegobipovogoxowi.pdfIn PDF document text
    • https://cdn.sqhk.co/sifilefu/jgeKVhb/tenotixemibatak.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/gcjrjaS/vifesezaxegakufopabil.pdfIn PDF document text
    • https://xekozetona.weebly.com/uploads/1/3/4/5/134508060/wijoxaxodavofogivibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_605a7061b49ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5ffd9c697fd7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_604f2e5d72440.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/0ihseig/save_earth_poster_making.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/fe57dcad05d330.pdfIn PDF document text
    • https://cdn.sqhk.co/xalurubizud/jdhdTM8/xefubatedepaxupumukabuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_6018349260e05.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/9fd1f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_600b57105ec48.pdfIn PDF document text
    • https://wewivipumi.weebly.com/uploads/1/3/0/7/130775870/8530780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6044950c85dab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_53543aabb82c440b8a49e14fc4f1095a.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_c82290abd3a146ce8a2ee56674554b16.pdf?index=trueIn PDF document text
    • https://1b4a35e6-4aef-4458-acaf-853c8ba53f66.filesusr.com/ugd/738632_ed9b7a99963b46179dcea63c868cbcbe.pdf?index=trueIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_1d60438fa8bc4648b826be912f669fd6.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_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 5476 bytes
SHA-256: 8833938bba99ab76fde7cbff44b493974e31620271311dfca320d20be0c4eab9

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