Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e63064a988a5b6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 02:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f47fbbc776d4625fe388320b05629506 SHA-1: f1b0fa4e30c30acaba50db55b1af4f10b9fc7dae SHA-256: 86e63064a988a5b6e22fbcef029513899046e6926c4c43c5a1a34138b34c82af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous distinct domains hosting PDF files, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ke-sen.com/userfiles/file/1631318444.pdf
    • http://efuegypt.org/userfiles/file/15314314511.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/19255716420.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3cbedd313---murigolasitimuwul.pdf
    • http://zabbeleecooking.com/ckfinder/userfiles/files/26014614697.pdf
    • http://stroyvodservice.ru/upload/File/78590644548.pdf
    • http://ciaooo.ru/uploades/userfiles/file/47618491557.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/65360298989.pdf
    • https://mashtalkandil.com/userfiles/file/66158364769.pdf
    • http://tochalco.com/uploads/files/53879683837.pdf
    • https://senegal4d.com/contents/files/92525929671.pdf
    • http://jezirka-biobazeny.cz/UserFiles/File/47609310034.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/59370297819.pdf
    • https://autosaloncenter.com/uploads/file/xarabusobizabevifimu.pdf
    • http://air-con.ru/upload/files/99843015218.pdf
    • http://tlumacz-francuskiego.pl/userfiles/file/59162440810.pdf
    • https://kop-trans.pl/uploads/userfiles/files/durugiduremilaka.pdf
    • http://chinawin-consult.com/userfiles/potiwijunu.pdf
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/mazigezulelekaxuxu.pdf
    • http://mya1fc.com/files/ckuploads/files/zirekopapezutikasivi.pdf
    • https://careersourceokaloosawalton.com/files/public/fujer.pdf
    • http://win-sonic.com/ck_imgs/files/pimivon.pdf
    • http://ever-pioneer.com/upload/files/bigafazerixerugezud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=quake+3+arena+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_off0000da4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 16792 bytes
font_01_sfnt_off0000f25d.bin
2642a9102d6d55d610dae3a87434f9b04f9efd34c3b7d98e96af2a5c8def9095		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 21372 bytes
font_02_sfnt_off00012a1e.bin
fad73fe19a9bafc07e417482b5df4db68dae5de4fefc0898bd3911494aa3fff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1E 10144 bytes

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