Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c194abb1e14979…

MALICIOUS

PDF

73.0 KB Created: 2021-09-29 08:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5490d5039c5592f9cbae4dfab6cd860b SHA-1: afcb4e8ff67b5a8c5c5cc9917fd06dd0872808ff SHA-256: d6c194abb1e14979779e7c7d2362a55dc59543c3d90bbeb9f3fc4107534ac618
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. One high-severity heuristic indicates a PDF link to an algorithmically-generated URL, suggesting an attempt to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bhhangkhong.com/upload/images/files/vuwinom.pdf
    • http://meadescafe.com/userfiles/file/9597041209.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xituxejiziduk.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/36942395909.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/eca2db5d18319f0767a1a6c9b984aa28/rufaz.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16325595907611.pdf
    • http://beming.com/ressource/site-image/files/52496776100.pdf
    • http://swapnakoodu.com/fck_uploads/file/zixagaxusabubulepe.pdf
    • http://hasyo.net/files/file/nobutusejodido.pdf
    • http://orvositudasbazis.eu/images/upload/file/dubub.pdf
    • http://suranareecommand.net/UserFiles/File/5589990213.pdf
    • https://tradingphrases.com/userfiles/files/20962406213.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/52591024398.pdf
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/retub.pdf
    • http://burbank.kopanramen.com/uploads/files/vameforonogij.pdf
    • https://appchecar.com/ckfinder/userfiles/files/75911453282.pdf
    • https://designclarf.it/file/82184316676.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bee0efe0e---semewopegupawivek.pdf
    • http://pc-driver.ru/userfiles/files/89055598529.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/wotivemewazugome.pdf
    • https://hnhaa.com/userfiles/tnejp/files/20699681983.pdf
    • http://fujavietnam.com/images/Download/68934437639.pdf
    • https://asken.as/bilder/file/pubazakogupegete.pdf
    • http://renknh.com/ckupload/files/semujelumikoviwe.pdf
    • http://www.kickcommerce.com/userfiles/file/bugatebugi.pdf
    • https://onwater.my/uploads/file/patepuwaganekolegelulelom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=assoluto+racing+real+grip+racing+%26+drifting+apk
    • 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_off0000b4a1.bin
d694a29bc95a0fbcfab693144084449f188d5a02c4834aa5d2c8f67931ca7936		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A1 19472 bytes
font_01_sfnt_off0000e5d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 16792 bytes
font_02_sfnt_off0000fded.bin
c29a1106ab63d1c58d255eca16ae3a7a0bf1d00bab9cd2523fa39a6f4d7d396b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 10632 bytes

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