Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b120fa8b76c187f…

MALICIOUS

PDF

84.0 KB Created: 2021-10-09 01:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf695bb7a66b20dca0e04dea7554d995 SHA-1: b9f0771eb7b638125750312d560127ffc48aa28e SHA-256: 4b120fa8b76c187f748c523fa2bca2148470ed361207a55bc823f33b54e144ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and heuristics point towards a common PDF-based phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oticonshop.net/ckfinder/userfiles/files/wopokosekuxilofufod.pdf In PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/84617631287.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xakux.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/17642169463.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/46244046810.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615e294b6131e---xafutimexebonasib.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/79361030755.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/xevoxapagebanirizez.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/jabazexedujopefak.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/80494504513.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xomiburup.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/11113021008.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/89538337597.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/47267809492.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/geliwijolawafa.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/48847216972.pdfIn PDF document text
    • https://siksp.megarhizo.com/ci/userfiles/files/59565908603.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/42246585737.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/rolebarakukilu.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/sefixa.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qqq2q65pesmct0h1ea48kh3a10/jawekojozugobasuso.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/xisul.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/wufojoxosape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=uno+draw+4+challenge+rulesPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/86849132464.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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 18440 bytes
SHA-256: d717bdbb5920179ec5ba7e0738af7da60effa1942d773ee76711a41d5b208f95
font_01_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12993 10728 bytes
SHA-256: 4fc1e472935e99b0ea9d4619c43d019723e348c99941b6df1ebce752859113f3