Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f7c56e358d3edd…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 22:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f7b1d4880be11cce3064bd786600f9d SHA-1: 826cef4dd5e65dc344dad8f61e98660fa44bdf83 SHA-256: 56f7c56e358d3eddd6e896f160a109ee9bf1f53280986b7cb945a94b8e35aad1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to potentially disposable domains, and one heuristic specifically identified it as a link farm. The presence of external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://urduhadith.org/survey/userfiles/files/64866190422.pdf
    • http://qazaqbanki.kz/data/content/files/19971733898.pdf
    • https://iuoshili.com/upload/users/files/42307106381.pdf
    • https://justforjetscatering.com/userfiles/image/files/golutuvinuvu.pdf
    • http://chuaphucluong.com/uploads/image/files/mabamejovudatilab.pdf
    • http://sudeoksa.org/userfiles/file/20210903072117.pdf
    • https://fallsplat.se/bildbank/file/jegexisakapewalolekanofuf.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c09d5cbbbf---89599999309.pdf
    • http://gokea.org/upload/editor/files/tofaxikakurapuxabisigu.pdf
    • https://hasekei.jp/userfiles/file/1988341481.pdf
    • http://rinsacars.com/files/others/luzagajigazelidivizonu.pdf
    • https://costarica4d.com/contents/files/pajinirakadijazuxetixota.pdf
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/7635856236.pdf
    • https://pingthye.com/userfiles/files/42449193855.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0ddb1296---44218711661.pdf
    • http://geotersrl.it/file/nasonazuxeridepotumi.pdf
    • http://www.findvoters.com/userfiles/file/xolojimelanadu.pdf
    • http://jinwoosmc.com/userfiles/file/zarugosajukazajewafowas.pdf
    • http://yasairamenbar.com/uploads/files/waxof.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/tuvuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gta+v+download+android
    • 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_off0000d504.bin
dc3716e7ae6e67936f727c572436cd44897f9d003b55f4e6b35ee8ae4d5ddd07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 17624 bytes
font_01_sfnt_off0001020c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 16792 bytes
font_02_sfnt_off00011a23.bin
a349afa236e739b8c4828d214e3fc2956cf405d0a8dabb5aaa704a020b3172d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 10132 bytes

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