Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f44b6ff949c872…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 01:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11bcff7900888286c2adc03e793ea7f9 SHA-1: e842f500a1b31d1d85a8d430a7fad604ff4840cc SHA-256: 57f44b6ff949c8727d1f8e0388aecfec25b31a4e90a06e3263ee19fdb1d5ab29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of many URLs suggests the PDF is intended to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613882d3ed0cb---32518770326.pdf In PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/fapepilatesinipogipo.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/suwenu.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/bovoxifawoposolobije.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/wuninikedejajopewabigu.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/vekolal.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/45274315316.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///loxusunanuwodefidokomopum.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/bogazuxalu.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/jiladopivebopaw.pdfIn PDF document text
    • http://svx.su/ffile/file/kuxodetelerenizusedoj.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/tirafubomapiwuriji.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/41412168125.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/lolakanom.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/keteguwugesunozimajemamo.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/53358794676.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/28377795994.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/21651053048.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/vosasezoxuzekigufodileku.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/35600180291.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410e02b0596---93663016229.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/kapikabiwab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+play+storePDF link annotation
    • 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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 17952 bytes
SHA-256: db43f38e2fa9b12fe3e211dcaa611f7fd5265c8151ae1e173ec6b3984e2210f7
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 10752 bytes
SHA-256: 7a263981c97149be68252d5d0f7e15976822d24d26d44b13245551a4f1d6bf07
font_02_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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