Malicious PDF — malware analysis report

Static analysis result for SHA-256 200563df750a1106…

MALICIOUS

PDF

62.5 KB Created: 2021-09-16 18:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 480ba038681d51ffd2982677bed27301 SHA-1: 54cf4fe4177d3d82377575543929ff826d97696b SHA-256: 200563df750a1106d5b084b5e6e99a34ec5da68628dd6d4941fcffb48753e905
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including one flagged as an algorithmically-generated URL. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=guitar+hero+android+apk PDF link annotation
    • http://newo.ru/files/files/lipusonulipimoritadeped.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/puwedane.pdfIn PDF document text
    • http://midel.me/userfiles/file/niperelitipatumumisa.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/komem.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/97609148857.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/xegesipifokidovogo.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/33839185516.pdfIn PDF document text
    • https://suksesunited.com/contents/files/likagisipujinebetujezituw.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/91733918083.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/baxibojewewirip.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/71431552216.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6ad534e4---kuluropatava.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/58203559610.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/zitavajabawugijavowime.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210909120606.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/bimamokufalexidisov.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/wuposotimobanelikegaxerov.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zimoxoxulukip.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/mujopanoxodezifi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dipalezinu.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/59294052527.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/66415519992.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/25386596761.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/41170458166.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_off0000afc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC3 16108 bytes
SHA-256: 2cff6c828072300caf18c868ed4aae0e0cb673706b3fedc46ab4d37cd9eb3c76
font_01_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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