Malicious PDF — malware analysis report

Static analysis result for SHA-256 a850b7045ab5ed18…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 10:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc276052c30043de1e4b844115fa49bf SHA-1: 7ba6fab30147f0a346fe7516257a2725d2abb8e1 SHA-256: a850b7045ab5ed18500fdf941fbe5b7c0a7c93774662fc257c2056c2c143d447
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 domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for redirecting the user to one of the external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d2c4a84fd0b0753ab115c2fa9f5607b0/62854420800.pdf
    • http://cen7dias.es/userfiles/files/boxeveludukomixuw.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/xajojitiredajomalol.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94912274084.pdf
    • http://autoscuolapezzano.it/userfiles/files/disafopisofubekigikaduwa.pdf
    • http://signauction.net/userfiles/file/larozel.pdf
    • http://kingsauto-bar.com/js/upload/files/jizusuwobepibomifagafe.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/10591449732.pdf
    • https://un7un9b3rl1pa7-99.com/contents/files/wulepanapoz.pdf
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/fibofe.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/vizuluzuxabifewizivezaf.pdf
    • https://harkakotony.hu/UserFiles/file/firopalawos.pdf
    • http://www.lovebliss.tw/UserFiles/files/xinovatasirilaxevowexu.pdf
    • https://casalindasbakery.com/ckfinder/userfiles/files/5081338671.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e8cd518955f455f9ff701ef70070f928/marajinajubewe.pdf
    • https://sanaspinler.com/calisma2/files/uploads/pukumujogibudawusilizafe.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210910_7FBD2E7D01993F1A.pdf
    • http://posicert.com/upload_fck/file/2021-9-2/20210902001810102196.pdf
    • http://pepinieres-soupe.com/userfiles/file/zotigelun.pdf
    • https://jck.ro/userfiles/file/99642409335.pdf
    • http://studioingtassinari.eu/userfiles/files/63434096165.pdf
    • http://synhbio.com/upload/files/gesizaguzolemamo.pdf
    • http://xboxheerlen.nl/userfiles/file/kenafapilanu.pdf
    • https://xuanhongkhang.com/upload/files/jatujubeg.pdf
    • https://ayurmitra.com/files/file/33087335049.pdf
    • http://ersenergy.com/UserFiles/file/ribeseterapanevedabame.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=idle+world+mod+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_off0000d83a.bin
e51196f053e31c919b54a718bec0f6e1163d668e800b89cc2d33402899d486cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 18016 bytes
font_01_sfnt_off0001071d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 16792 bytes
font_02_sfnt_off00011f34.bin
745525e73e08bc43e232330ef9eb627f7768a91703f84aa5f7c6c848df9e3741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 10220 bytes

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