Malicious PDF — malware analysis report

Static analysis result for SHA-256 292594b5f446f457…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 08:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8eb0ba38581246c05fb61c553a3270b SHA-1: 5e8c507f4adf6518fad59706f7d5e31fd815b2ab SHA-256: 292594b5f446f457ca16e8a14f3202e7c753b8ec79e84f8df7b7273b8159e848
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF acts as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. The presence of embedded URLs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://diamant-x.sk/UserFiles/file/51760700524.pdf In PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/ruwilitogutowamev.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/3194354547.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/63b0e522ea487abdb12c7585808584c8/69878777244.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/jorenipetefobokoduvononi.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/jetenibaporapirimoj.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b56bc80c88ddc28ac4743087a69afc74/51398425948.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/53030410128.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/37610240458.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/kilimivurog.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/95383612004.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/selubedukimujuvupaped.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/80266554600.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/97166199537.pdfIn PDF document text
    • https://matrixx.lu/images/83508849124.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zazaxiwubovipenuda.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/gazulamenipajomavo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/vabozasijug.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109032121403761.pdfIn PDF document text
    • http://reopen911.info/media/file/86633913984.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/pizalefage.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/pixar.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/pejapokojagezot.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/mibuwaxekivajewovepave.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/bixazodebakewopa.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-9/20210909151517265318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sat+practice+test+questions+and+answersPDF 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 17872 bytes
SHA-256: 840cad8f9d6bb020e62c316c7e381eab92d98624d7d819f95f72f964eddab4e7
font_02_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 10868 bytes
SHA-256: 20a4fc831c6628a141359637bee56d8d1deb95accf3f967485bd1219848a2466