Malicious PDF — malware analysis report

Static analysis result for SHA-256 53af245072cb54f9…

MALICIOUS

PDF

85.1 KB Created: 2021-10-11 21:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fc92aad93425650e88ee3d7b9823bf25 SHA-1: 15ccfa0397c0e472cd94ff5e958e7096fc1dba00 SHA-256: 53af245072cb54f970f89e0c53caa41281e83ab3bf6718d6f073684b8b4f7679
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=scary+words+that+start+with+p PDF link annotation
    • http://yakutiaprime.ru/SITE/files/editor/file/pataz.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/bonojalive.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/7070908386.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210929_9D162A763906EB15.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/lexunalizajofe.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/24161521487.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/solevufaluva.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/gopepunasupenobofageke.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/jokote.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tipope.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/tanunivugu.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/pipoluwulome.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/42485267564.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/jomajipep.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/48671526962.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3608ddcb3ae9961f82cc4226c20414a7/lekuxibibasurox.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/bowasilavexigugekisune.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/7185006666.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/kosugokivuwizodapezane.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/kunezozetifaxotaf.pdfIn PDF document text
    • http://moneymaker-gold.de/files/67080161338.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/wilodolavukuso.pdfIn PDF document text
    • https://basisnomor.com/contents/files/jabozajosewujaxixuweson.pdfIn PDF document text
    • http://toonesk.com/upload/dopujadabejala.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/83783688059.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_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 10604 bytes
SHA-256: b95d1acee41a851c5e93f813bb7e088765eb424ca5c614d21d8e56b6ea95f91d
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 19244 bytes
SHA-256: c32f3dceb0de971152365a341f70e686503e213654b1393f271e1cd75a9e65dd
font_02_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1