Malicious PDF — malware analysis report

Static analysis result for SHA-256 41205a24b6632c9a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-09 07:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 04f941eb7db908e07b1d5647a2a7f619 SHA-1: a128678ab3dd1649ddc93eb9744f4fc223016378 SHA-256: 41205a24b6632c9a416b25a0f4d1dbb929c55ccac7a994d261014d4bdc9608e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the nature of the link farm suggests it's intended to lead users to malicious sites or further stages of an attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://pandoraecza.com/genelresimler/file/tarumogitu.pdf In PDF document text
    • http://hankyunget.net/userData/board/file/92355303275.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/wozegudetabewu.pdfIn PDF document text
    • http://domosplast.hu/files/file/monofikatulasubavusowo.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/83564147053.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/mefemenudadur.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/60383135087.pdfIn PDF document text
    • http://atek-ent.com/upload/file/55838597464.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb9d5c273---46883150563.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/63463099069.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630794972.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xaxunisorogorowugavof.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/tozavemufamirulematifixa.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/83752189303.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/17807205607.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/dibabixejixiforoto.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/sebimoterilotikasexebul.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/38242958620.pdfIn PDF document text
    • https://digireg.com/upload/bozalatoroxogagorusakukam.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/58938432922.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/39412852476.pdfIn PDF document text
    • http://peoplefoster.com/pliki/18762056122.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/63753245065.pdfIn PDF document text
    • http://tchid.net/userfiles/file/tarawewifamesaketukivag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cheat+hungry+shark+world+2020PDF 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_off0000b01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 11100 bytes
SHA-256: 41218473ceef33a0a33669640795e01808facac2fa11699377d7a5c9070b9f25
font_02_sfnt_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 14956 bytes
SHA-256: 8b97c8b722e422c0b4a7cb7bec3a47eedecbb89fc550b6e58d4ae057c35f3650