Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbfef320e101717…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 19:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 335d4889145a5be266fae9a3671ba000 SHA-1: 77592ecbcd71cb9037ba00fd185654bfb53ae637 SHA-256: 6fbfef320e1017172461dd3c64439effde5d53b43990faee626423614db7be0f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and exhibits characteristics of a link farm, with a high number of embedded URLs pointing to potentially malicious domains. The presence of embedded JavaScript suggests an attempt to execute code, likely to facilitate further malicious activity such as phishing or downloading additional payloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4513

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.
  • 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
  • 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://crewmak.ru/uplcv?utm_term=mookuthi+amman+watch+online PDF link annotation
    • http://goldcoil.com/uploadfiles/files/xodobakeg.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210902090407.pdfIn PDF document text
    • https://12shio2.com/contents/files/gifosaturawokozuturilegot.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/95547591691.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/latuduratogoju.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/baburakagatisojuk.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/75515312512.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/81711054515.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/rezaxudep.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/10218225429.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/wapasositibavojalit.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/65028133882.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/tidiwodivesamife.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/fojokasigarejineziz.pdfIn PDF document text
    • http://rc-modeller.se/images/file///14017983168.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/71576299607.pdfIn PDF document text
    • http://esistore.be/userfiles/file/83309803968.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/99314984243.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/rudenosiziged.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/loweretopese.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb08ab9c6f---88987434129.pdfIn PDF document text
    • http://epicridesnepal.com/files/bokobumofisa.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/texodevikibakexubomakobo.pdfIn PDF document text
    • http://limoride.net/gallery/file/korefiji.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/jozazim.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/13954904310.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 18492 bytes
SHA-256: 50dddea42ee529185017a6ae2b4b82f4d7b47dfaab0ad926d1e147b04e63aee3
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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