Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89067e0171aac43…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 08:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8835fdf2b982a42c0f2ec6439842aaf SHA-1: c39c756f3a01e4e25d888887cffec60f7327d7ab SHA-256: c89067e0171aac4341c640f9dab859dbb6aef28bc26d880d93190ae10551bc8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to act as a gateway to other malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=how+to+set+weather+and+clock+widget+on+home+screen PDF link annotation
    • http://benthanhsgfarm.com/images/uploads/files/lugaleximexuzere.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-11-08-55-08-88.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/wunodubusenifegi.pdfIn PDF document text
    • http://blgjad.com/upload/files/marel.pdfIn PDF document text
    • https://actor-conseil.com/files/file/vagitedexewididoteg.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/maboju.pdfIn PDF document text
    • http://aimic.com/userfiles/file/gebasone.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2m0oodvcub654fbrg5jfg9cd4a/kewudizelavomik.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/vibedibizositen.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/99099934411.pdfIn PDF document text
    • https://irrisyst.eu/files/file/4069458265.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xatenadeluzojijofozezata.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/74753130524.pdfIn PDF document text
    • http://mayjack.com/upload/files/vupilovogadozelif.pdfIn PDF document text
    • https://fond.ru/userfiles/file/90963569295.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/176125333.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/52047500022.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f09948d0---72451931417.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/xoxuk.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/kebusasizetugabasifakexa.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/lavakireretiwexafitaxapa.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/64398481228.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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 17668 bytes
SHA-256: 17d0a0d7e472ed2ad59637c1b5866ac3bf842821d2d0bb0a92aa49df7b393c2a
font_02_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 10984 bytes
SHA-256: 41bb7cf114b405319e93cb0d5f084dfbd4b58ce0be1e32a667e8d2eec1a87779

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