Malicious PDF — malware analysis report

Static analysis result for SHA-256 4147e2b5d02d1268…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 14:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da6ea3c28ebc0c94f4a31a0b81fb083c SHA-1: a39e400e054149a6d32a68c7e5a31436248624bc SHA-256: 4147e2b5d02d12686c5457e7ce8bebff64f5d0c345ead8f583a19c3346af8c12
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, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

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 https://garglob.ru/uplcv?utm_term=batch+photo+editor+android
    • https://alternativecarrepair.com/userfiles/file/tewifedaropovup.pdf
    • http://www.colormotion.cz/UserFiles/file/molomazaziruwigawitime.pdf
    • https://aldwalia.com/userfiles/files/zokoj.pdf
    • https://www.institutvzdelavani.cz/files/popif.pdf
    • http://jszl-rolls.com/filespath/files/20210906081008.pdf
    • https://sproname.com/files/userfiles/files/28666863199.pdf
    • http://goldnumber.info/userfiles/file/kikusupeti.pdf
    • http://silver1979.com/upload/file/domorarogizidigorapij.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132c17f916f0---24124296603.pdf
    • http://novehorizonty.sk/userfiles/file/xajilul.pdf
    • http://templeton.sk/userfiles/file/37483356226.pdf
    • http://menifee.hanasushichoice.com/uploads/files/wixonusilopadojevulikov.pdf
    • http://morakothotel.com/file_media/file_image/file/kepimokosimivajimef.pdf
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/pekezezivasosap.pdf
    • https://renewone.de/files/84529803121.pdf
    • https://moolans.com/uploads/files/foxanazomodu.pdf
    • https://photopoligrafic.ru/ckfinder/userfiles/files/mowuguxedumerubon.pdf
    • http://optykglowacki.pl/obrazki/files/56298334179.pdf
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60506017693.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/17004747569.pdf
    • 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_off0000b678.bin
41dad9343dd6ee67805ace874d406bcf00dfc083ce1e694bdbb376ef6de089a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB678 10452 bytes
font_01_sfnt_off0000ce25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 16792 bytes
font_02_sfnt_off0000e637.bin
7bdd0a1ccd532286f1abb57eb0e9974ec216459ce41417a12384a412e3c73e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 16376 bytes

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