Malicious PDF — malware analysis report

Static analysis result for SHA-256 9795879bfde840fa…

MALICIOUS

PDF

76.0 KB Created: 2021-06-12 12:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 09743893c3fafd6db3e9aa51725b452e SHA-1: 364c90e02155b277fc80b69676921c843c8b8973 SHA-256: 9795879bfde840fa77127dda16d6814fbabb6392b0736a57abb05697b6d4160e
186 Risk Score

Malware Insights

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

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 0.9956

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://garglob.ru/pbw?utm_term=cbse+grade+11+english+textbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450724/normal_605c143d1104e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_60bdaede042f1.pdfIn PDF document text
    • https://wapolamezabez.weebly.com/uploads/1/3/4/0/134041225/vamemuji_xibep_watirek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_601f2066d83bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_6010553307972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369141/normal_5fe47fad24611.pdfIn PDF document text
    • https://guxizipib.weebly.com/uploads/1/3/4/3/134367178/9536365.pdfIn PDF document text
    • https://zivixitusinuz.weebly.com/uploads/1/3/1/3/131380786/gujaxas.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/dda3d.pdfIn PDF document text
    • https://kimakinogi.weebly.com/uploads/1/3/0/7/130775446/41122a6323.pdfIn PDF document text
    • https://vimosetadasosus.weebly.com/uploads/1/3/2/7/132740377/mofomixuxut.pdfIn PDF document text
    • https://vixoketos.weebly.com/uploads/1/3/1/4/131453026/8832261.pdfIn PDF document text
    • https://zusadubojurumez.weebly.com/uploads/1/3/4/7/134703186/460d1c.pdfIn PDF document text
    • https://kikeletiwemuk.weebly.com/uploads/1/3/4/6/134671512/pofubejexowow.pdfIn PDF document text
    • https://xelemuzeb.weebly.com/uploads/1/3/7/5/137501053/7885346.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/439fd4c1-e23e-4728-8e89-cabaa415871b/how_to_get_brother_printer_back_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed8c8d03-1b64-4615-be31-7b5cc6b13a49/poetry_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43254a5-3514-478c-b129-58549fad92a7/61925545727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c684d9-0355-4ac1-8fb7-8fdbc61baa5a/how_to_answer_political_science_essay_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418eefd2-4225-4fbd-b327-c2d93d424046/fenemusemutadabejaz.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/w/file/fetch/145152255/xirazuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cbb70c-a7e9-4afd-aace-182d41f58ede/gununuvamojajuwetatoraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4126a0-f360-4123-8fde-7e94558ee9f7/purajibumokub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fc7009-ab99-4ce1-a44b-290d3ce88b13/duwowerekututusovozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a7fcf7a-caab-4970-a97b-5ee614e1326e/86314216290.pdfIn PDF document text
    • http://ganosidil.pbworks.com/w/file/fetch/144982515/movies_4k_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e3039b-f7fd-40c6-a651-201c7e9e3aec/71731828777.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_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 5316 bytes
SHA-256: 739c5b03b8aac7da7e208904922e37e0da5be38997b1bdb652a94a5a8ca0273c
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 11340 bytes
SHA-256: 8676ee6f080cd1e781cb3eb9fc86529fe7163791231da51e43d944cffffc2ab6