Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8a22514dbaee5b…

MALICIOUS

PDF

84.6 KB Created: 2021-03-06 09:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 937dc86d730f9a3a727e5f879fed19f6 SHA-1: cd5ee0ce12c514a92d66e2e84901b5df426379cd SHA-256: 0f8a22514dbaee5b19093e19e6bda4346b2b40d6d62357ad903b030cddf87493
124 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF documents hosted on various domains, some of which appear to be disposable. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier also flagged this PDF as malicious, supporting the assessment of a potentially harmful attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6520

Heuristics 4

  • 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://golowaki.ru/aws?utm_term=hornady+300+blackout+load+data
    • https://cdn-cms.f-static.net/uploads/4415930/normal_5fdc22505dbc6.pdf
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fd2ac9573194.pdf
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/wubazo.pdf
    • http://balifruit.com/how_to_defrost_samsung_rf263beaesr_ice_maker3xf4d.pdf
    • https://cdn-cms.f-static.net/uploads/4503584/normal_6013af1d60da7.pdf
    • http://yewes.fun/link_health_app_to_discovery55vqc.pdf
    • http://ver-alex.website/310254796669mvxo.pdf
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fc61e5d016b8.pdf
    • http://nimened.66ghz.com/dakokimiparejawadoxeje.pdf
    • https://rakerekibakefe.weebly.com/uploads/1/3/4/5/134596095/zixizuribak.pdf
    • http://lunesygets.xyz/opaque_white_plastic_sheeting2zlxl.pdf
    • http://axecheat9.xyz/71067218761901r4.pdf
    • http://kraftmann.su/99904644175jj9fj.pdf
    • http://fabermanufacture.ru/piwiwigu7o0lx.pdf
    • http://de-bewertung-id-q2e5t23.top/475888429567hmsz.pdf
    • http://povujijizota.epizy.com/38362639631.pdf
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_bdfac57cd049428c91377119badfb7a8.pdf?index=true
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_6658d528b1014937a6b997d130668150.pdf?index=true
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_bb32be81d28d466d8cf48f37aa63471b.pdf?index=true
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_2019c8731eaa4bfe888cf9215a9ed1c8.pdf?index=true
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_fb8f28838961410ba4393193ff458a21.pdf?index=true

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