Malicious PDF — malware analysis report

Static analysis result for SHA-256 26abd982e6777149…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 08:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9abbf8f94225826c2cd76365d639a37f SHA-1: 3509fc1d9a7b0c38fa09918f3c3997bd0b68fd65 SHA-256: 26abd982e67771491c63110bb5a6bd032dc7c5ffe9db18ceb6d9626626e2ced8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely executes to download and run a second-stage payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://colafranceschi.it/userfiles/files/vajexamelunakodekeruk.pdf
    • http://nesemlak.com/test/images/uploads/files/60407437211.pdf
    • https://riolisboa.com/images/ul_files/file/vk7u4NDd8aLX.pdf
    • http://naturestuff.nl/siteimages/file/zajekofulon.pdf
    • https://atvatextile.com/upload/ckfinder/files/makug.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/89837748999.pdf
    • http://th-hl.com///upload/files/34098916755.pdf
    • http://innovatepc.com/userfiles/file/42336348450.pdf
    • http://ahkjt.com/upfile/file/59799035233.pdf
    • http://aerotechgroup.ru/img/outer/files/80418102405.pdf
    • https://marugame.hk/editor_upload/file/93084875039.pdf
    • https://psychologgia.pl/Upload/file/76906524564.pdf
    • https://12shio2.com/contents/files/wumowimanefidode.pdf
    • http://zamdq.com/filespath/files/20210913231144.pdf
    • http://pn-tech.net/userData/board/file/71659725112.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1631429226.pdf
    • http://jandenzobv.com/image_uploads/file/tuzazelebo.pdf
    • https://cuatudongnhatrang.com/uploads/files/98680520282.pdf
    • https://linlinline.biz/js/ckfinder/userfiles/files/lufaxewopojetu.pdf
    • https://ayurmitra.com/files/file/digetaxolovefe.pdf
    • http://bloemenwinkelindex.nl/images/uploads/bikusu.pdf
    • https://tavio.ru/files/file/9804006886.pdf
    • http://creativecoms.net/userfiles/file/kevaragarizisu.pdf
    • http://palami.by/images/file/94386678959.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/utbn52jt44g4525h69afhh3gmk/1511465117.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+movie+torrenting+sites
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c03c.bin
de0d634d6f7a7329d8a27c24480144e83b9176090ae4fe5f1700aa2454ddccaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC03C 10744 bytes
font_01_sfnt_off0000d8bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 16792 bytes
font_02_sfnt_off0000f0cf.bin
eb40f2deb663b25f1e85212ad29a375d0fc5682157594103602f1baa17f975fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 16140 bytes

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