Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6391b9a38d972a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 10:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 433a725bb890e37407dea5927bfa1b36 SHA-1: 8884f7460e41e008206864681dce9d534b5b675e SHA-256: 8c6391b9a38d972a78a131701820fffaea45900b1618a599c8c5d11ce1f0d4de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various PDF files hosted on numerous domains, likely as a lure for malicious downloads. The presence of external URIs and the overall structure suggest an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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://sakura-bashi.com/uploads/files/202109112107249962.pdf In PDF document text
    • http://fatimaartwork.com/userfiles/file/weforupod.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/92071112804.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/7380997450.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/fejokodolawisoxiz.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xaxipozewafositigoji.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1c1b6fa5---fopisebotepofix.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/58871249429.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109012328584481.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/32253066473.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/12355921117.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/26500324393.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/95385447266.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191715425336.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/vibadejedavutufe.pdfIn PDF document text
    • http://maxbrio.kr/files/files/3383710136.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091809451973499.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/39113382683.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/muxizamuzo.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/perew.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161406b116ea44---99733643240.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/66047189168.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/53061939765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+xhamster+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 10700 bytes
SHA-256: 7ec1cb8d82c2647b7ec1f5bfad507252aabeeb1ba96665eb9d67d21898abb012
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 17760 bytes
SHA-256: e4918985c6f7538f1b40be37b06d4232db9d277ce4e029c2eb0f0f7a6590d782
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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