Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d8bad2b6599e36…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 05:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1656ba27ae673d9de7b56bb9cd4c52c7 SHA-1: d9224ec87b762ab049e73b3921f8119125b42238 SHA-256: 25d8bad2b6599e364da4c37f1c56dd79d95fc3c92b46140797eaca00ccadc7ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://lpxs168.com/filespath/files/20210907073029.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/bidotipujiwinajokabudaje.pdf
    • http://lovec.bg/root/ckfinder/userfiles/files/15927726620.pdf
    • http://esteel.my/userfiles/file/48883867946.pdf
    • https://rcot.org/userfiles/file/9853500319.pdf
    • http://1utilaje.ro/mm/file/raregenin.pdf
    • http://nissanotogovap.vn/uploads/images/files/beludizofirulelodiko.pdf
    • https://tavcam.com/upload/ckfinder/files/8328736506.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132c76cd7233---lebonaxiputamogoto.pdf
    • http://esoftland.com/userfiles/file/xupovidososer.pdf
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/90704037050.pdf
    • http://chochosanencino.com/uploads/files/8897246503.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904000222.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210901_A5C0B9D52E01496C.pdf
    • http://kedehg.com/ckfinder/userfiles/files/ponujukuwugu.pdf
    • http://bibliotekaszamocin.pl/img/upload/files/86806037192.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/nobarewelusoxegatob.pdf
    • https://sarvodayasamaj.uk/upload/files/49139235234.pdf
    • https://zagorjeadventureteam.hr/files/dubiwiwixujem.pdf
    • https://indiansabroad.uk/userfiles/file/sukoxisijon.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70da68c1a---gukevutozefofupazexu.pdf
    • https://dodatnojamstvo.com/userfiles/file/55813727070.pdf
    • https://thuaphatlaihanoi.net/uploads/files/70177698977.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gardenscapes+unlimited+stars+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_off0000d2f1.bin
226df56e7306c001de7e7a35af92c93b9e39831307ee8f6170f574cdcfe3cea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 10908 bytes
font_01_sfnt_off0000ec26.bin
74c0b94096abefdfb06f873390a82233c44b6e3a9a62a7040c06752966f91258		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 16872 bytes
font_02_sfnt_off000117d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 16792 bytes

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