Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b258dab58e3061…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 12:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f3a5aab0957cf14a66251897f8b760b SHA-1: 3f45ffa027c7a3605c39ac24997487765280099b SHA-256: b3b258dab58e3061c9896349a3c62ae3c688d6ae1bceebc63242d76088b1433e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=visual+studio+code+build+android+app PDF link annotation
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/5647115661.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/81971442154.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/gemedusijirikis.pdfIn PDF document text
    • http://mawarids.org/mpfiles/file/25899190493.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/bafusumuxepadizaluro.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/gesavisoxumiwonokavoxu.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/53683707731.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/4144566546.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/lilofavobunuxedijorerikuw.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/83948199445.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/67689676065.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/40544196166.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210919084549_633751679.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/16473706394.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/bijasa.pdfIn PDF document text
    • http://centrons.com/uploaded/file/68500661861375fbfd36e5.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210914022522.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/73727922079.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/43162644828.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/vukulajozisor.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109051422576006.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zekidijixinub.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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 18980 bytes
SHA-256: a81839468345ba1f882726966ad76c68bd57a27a2221c984995ea7fe88e0aed3
font_02_sfnt_off00012af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF1 10716 bytes
SHA-256: 1f9baa71202c913c9cfbf843bd4999faaf3842e39002c06c614fb96bd06f8be6

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