Malicious PDF — malware analysis report

Static analysis result for SHA-256 f577ac4ac0311117…

MALICIOUS

PDF

93.8 KB Created: 2021-09-24 10:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eda22d37a0874ad6ef6d9cc22c315a8a SHA-1: f628d37361a0d5d3a03ed3fee45c92118b472dd7 SHA-256: f577ac4ac0311117ef842c54e3575f7a4c9a590de7070bd3bf0b0365f87a5200
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to potentially disposable domains, reinforcing the phishing or malware distribution intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=content+analysis+methodology+pdf PDF link annotation
    • http://www.bash.cl/media/file/lewakodusuxiwumimovol.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/58091771084.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202196145783668.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/tajitopeto.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/17391199458.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/wawepege.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/mupamifunoz.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/811956206.pdfIn PDF document text
    • http://riviera.az/userfiles/file/matawarafenitanirikazoje.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/jitor.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/koluvo.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/62409107470.pdfIn PDF document text
    • http://rc-modeller.se/images/file///34002499586.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5362e199cc46c17889a071af26aaad44/rufivasomozezuzudi.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/bepuv.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/98981966977.pdfIn PDF document text
    • https://duvanco.be/docs/files/xemabigisuvenatubupemiwev.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/7749070883.pdfIn PDF document text
    • http://ubest.ru/images/file/60744954361.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/87640113162.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/lokam.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/vavowiluxesikedise.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/taduzewiduf.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/22684521656.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/sewutewiziwefagubinusu.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/ferumisularimisobukuliju.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/vowozutimoganupulemuf.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_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 18780 bytes
SHA-256: 702929bbe52c402900f3eb32b7333495acfe7330059a201dace3734ff16f0602
font_01_sfnt_off000137cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE2 10992 bytes
SHA-256: c4d4b3b1dcdf8f00fa998f5926e92a8121f28cf769cc0d7d4494f4c8e7db2a23