Malicious PDF — malware analysis report

Static analysis result for SHA-256 05699786962501d6…

MALICIOUS

PDF

76.4 KB Created: 2021-04-08 10:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9ad3481b11011964aac7b38b75204ca SHA-1: 721d9685d4addc028463270fe1d772832f305b3e SHA-256: 05699786962501d6500fd9f62152d8457cbf410f6b55171b46b832e4423d351d
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=shark+cordless+vacuum+cleaner+instructions PDF link annotation
    • https://cdn.sqhk.co/jijatidos/hhbuZNr/real_racing_3_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/ZWjakyp/49935539455.pdfIn PDF document text
    • http://coins24h.com/how_cash_dividends_are_paid9twtr.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/cthfnge/siniwinoduluvosav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426280/normal_5ffe61ab4b9d7.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/hhghaVX/74449575976.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/jkji4ia/laruxuranuvigozafogoxeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6016eb8ad873b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_606760fa96439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fe64be289346.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fde7b667b881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472506/normal_5fd3a7154b5d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_5fe0bba33c2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_605444c45d0cd.pdfIn PDF document text
    • http://biweekamnf.com/jelujedevixaz61dw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_91c5acdad6504697ba670b1f31f10d25.pdf?index=trueIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_a8257a77f45647af8d51df609262c5ec.pdf?index=trueIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_64cc9dd734b8438ab5ba8f2ab561bfd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6bf733-6ae4-4bcf-94e0-fc19d2129d03/diary_of_wimpy_kid_movie_characters.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_448f254ea5944a2987cd43e1642c8fcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baafd56-4b2b-4c08-9640-202b46ed2ff8/98349126683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c17e8e-126a-4a08-bc08-a8b77cd26bf9/lord_of_the_flies_full_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2002e11-e721-47a6-ac33-85dac2a94b51/the_lord_of_the_rings_all_cast_then_and_now.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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 5408 bytes
SHA-256: fdd976efd2ed1a6432439cbcd0993e0751595fbc453b71fd84bdb66d20b556d0
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10548 bytes
SHA-256: a559cd8a79b9d605a4b5052bdc5bb6c3a99782509fb41869eed6fb84b0b7e3b7