Malicious PDF — malware analysis report

Static analysis result for SHA-256 f759f0ed423e207e…

MALICIOUS

PDF

79.7 KB Created: 2021-10-22 23:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: df32a860aa2eb1f26d9d6422f75212bf SHA-1: b42cbbe626abeafd1f2990acf4fd0e5479be1bb6 SHA-256: f759f0ed423e207e35d712d5c30a779b2afdd0ad07dd0baca47c0b1e971b22dd
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. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the true destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=a+pdf+page+cut+serial+number PDF link annotation
    • http://dream-mebel.com/pic/file/ximajimulu.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/12578690962.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210915210544_zs6yzy.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/lukenomavasapogu.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/duxinib.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/bibuvozibo.pdfIn PDF document text
    • https://phnews.ro/files/file/fejuvatu.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///bexusoguditeti.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/66523062952.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/witituxazox.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/komebopabugifo.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/69564409066.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/89420090052.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615052666a358---13399740668.pdfIn PDF document text
    • http://beta-rc.com/upload/files/1660818651.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/70108854513.pdfIn PDF document text
    • https://harmony.im/userfiles/file/44338372497.pdfIn PDF document text
    • http://dd-eng.com/files/files/31284928808.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/48672213493.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/19476806206.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e48938d4bb73130f40614f69db0cabaa/49590858837.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/17826991757.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/pamutujojew.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 17260 bytes
SHA-256: d44d4e346071779860b1c436cebbdf4ade107c11c0d4958c9101033ff718e066
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 11064 bytes
SHA-256: bd7b31eabea76b96b314481e05b9ed8929bebe0e739c4a613d82c47d7bfccfef
font_02_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.