Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f75df6b0a055424…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 02:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6073526c312861e58a93a275ddcae16 SHA-1: 96d0773f09c37102bc205bc890b803eb8cf91506 SHA-256: 2f75df6b0a055424b0e8dc4af15e96f99db424009578d6cc42646c3ab429fee3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to other PDF files hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pamatudarbai.lt/ckfinder/userfiles/files/gowisopemo.pdf In PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/kunulubep.pdfIn PDF document text
    • https://wrd13.com/force/file/90746272888.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/31886317832.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/lunalajixesanutakibizev.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161341c47e5eb7---15654818015.pdfIn PDF document text
    • http://goldia.cz/data/file/wakosabigawufisuse.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/17850788148.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/xakusowurim.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/33072184819.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/jodudal.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///rezezixuvilax.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/18368949671.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de37cb3f9---79480348822.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/5829710977.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/tofobisofipojalapir.pdfIn PDF document text
    • http://cafesca.info/ckfinder/userfiles/files/jugajilom.pdfIn PDF document text
    • http://poiskvod.ru/images/file/petebirubupuwomelapadaja.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-8/20210908195948134197.pdfIn PDF document text
    • http://annabarons.lv/files/files/vovewom.pdfIn PDF document text
    • https://premiersuli.hu/files/files/telifunuxeled.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/makoresesitabexekinavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ps+cc+2021+apk+download+for+androidPDF 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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10856 bytes
SHA-256: c5eaf4d2c60340ac7aa9a279ce0f5979237c67ea216fbc20c9e25e4a168c857f
font_02_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 17380 bytes
SHA-256: 782531ba8f4721f358a1ebcdfb7a88e588808a2553cc2a045473d6234eec0b9f

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