Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f4b6d09a04d56a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 11:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a9b28e6a091f97b1f7ccfe386da3701 SHA-1: 68ce301dbf41eebf197357dd81e386d80dc42331 SHA-256: 92f4b6d09a04d56a7a585d12e726c86db3afda85bc233d1ed2f9ea2f6f8fcafe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of link farms on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cortocircuito.trialpanel.com/images/Upload/files/63255197647.pdf In PDF document text
    • http://clinton.abwingsmd.com/uploads/files/7942845091.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/gulikomosor.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/xusizabagivevilesirexoka.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/jexikexe.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/zejujilelekuriviper.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/i9qforo0nb83tefetdd8utnin4/77264298642.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/81445817158.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/navadikazoj.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/28308862674.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/sasasesup.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/37986302568.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/tefizi.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/tikofonemukane.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/lifovexuvozunebokof.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/pufeximisoketipigaw.pdfIn PDF document text
    • http://idroter.org/userfiles/files/buxonevozixizusat.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/ruxotawaguw.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/vemorira.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/27764543038.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210903185903478890kr8cg.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137801166157---patejakodilukiwejemas.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/52490538736.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/rixadele.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/tazemupigonuralusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=shop+titans+epic+idle+mod+apkPDF 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_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 16860 bytes
SHA-256: 568bf179b89254bb59e9dbcaf999aed4752aa69a09709394967d487d6e25a274
font_01_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 10844 bytes
SHA-256: 5fb1562e9a60eae34ce356e6d20077e1f889216807e9e6ab28d9f975f121cf3b

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