Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8b6638e3e49b95…

MALICIOUS

PDF

70.7 KB Created: 2021-04-03 04:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 71d94b6c82a3712944c1b20392bee898 SHA-1: d92f2357b133c7e252a5154b8387dc6762a322cc SHA-256: 1c8b6638e3e49b95fa8b1922981dbba6b23d9f98a4c85c7cd3f4bab356204604
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection 'Pdf.Phishing.Trojan' and the presence of embedded URLs strongly suggest a malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4770

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://jumiwimov.ru/award?keyword=endocrine+system+pdf+in+english PDF link annotation
    • http://alania365.ru/apsc_exam_2018_answer_keyerd9i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476437/normal_603a4dbd03e8f.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/mofurijuforoviluvubibo1vsc.pdfIn PDF document text
    • http://findssldz.xyz/what_is_the_best_cva_muzzleloaderi03u5.pdfIn PDF document text
    • https://xasigevas.weebly.com/uploads/1/3/4/5/134595911/nazuwumuwo_zajaturaluwinod.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/18kC9s8/idle_world_homa_games.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/hjbq34z/g_switch_3_unblocked_games_weebly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_602667091b3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_604fe9ea21103.pdfIn PDF document text
    • http://fb-copyright-help-from.com/sufapobilofobigodinofuzek58xpz.pdfIn PDF document text
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/9077071.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/e196c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_604d34385f04c.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/16s5fb1/23808771477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_6042d30fb96c3.pdfIn PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/lakutomumezewosojo.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_d89085bcef934968ab57c9a6751214ad.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_4c6a4f5d6aa14b30924176694e352b2a.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_a0afffb0ceb3406eb27224c8880f5a3c.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_4c65196e97bf4c92848ef55c94ef64bf.pdf?index=trueIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_cd7b041f3ccd41ce80dc572e848ea691.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_fbd78d8ad84a491893ee1581759cdb16.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_1b9dfd76161c4df4ae9910f7fe4a0f74.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_d8473af0100a450bab7595761f4f3e6b.pdf?index=trueIn PDF document text

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