Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c3a7695458114a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 03:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a9266871898be143c0d96becdc238a8 SHA-1: 7bab386b9b1676a31179d1afbd7546dcb0d10bbb SHA-256: c8c3a7695458114a3d357b9c8e807235d3894780609be3c782eed594eab6a65b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The numerous external URLs suggest an attempt to redirect users to potentially malicious sites, consistent with phishing or malware distribution tactics. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a large number of links hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=malayalam+movie+123+go PDF link annotation
    • https://thietbixanh.net/uploads/files/97077607453.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/25146825354.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/14450566642.pdfIn PDF document text
    • http://megalaserasia.com/upload///52864032097.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/vironasotapovitoxa.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/31584157260.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/1395139820.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/25254324812.pdfIn PDF document text
    • https://maturana.cl/upload/file/neranazewugipivawupo.pdfIn PDF document text
    • https://teamcode.net/upload/files/gupixegifabibepixefoba.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/24866876375.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/karutimadibamewiramujed.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109090131311460.pdfIn PDF document text
    • https://heyratacademy.ir/file/dubipa.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/47636580551.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/54733778777.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/diwuxulibiwefitabumuz.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad7501490---nubatakujajesumeg.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910002125.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gozuzapilibop.pdfIn PDF document text
    • http://rurisnet.org/images/file/65998576286.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://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_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 10496 bytes
SHA-256: a9c6cd5d398dc6aa96192a54671e5670a94dfedb33b4d5c145744d46ed17968e
font_01_sfnt_off0000cbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 17184 bytes
SHA-256: 0b1df551f08adeb4825e26ba9e017e44b6f7451666b15bf4178b09c49aefa72c
font_02_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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