Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f2a1a17cea9031…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 18:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a669814a9660fd84fc291bc2f99089c9 SHA-1: 3b2e981ca3ef246bf1a9035e64f15a71fbf71f69 SHA-256: f9f2a1a17cea9031463f7a377dbff1af90dbcff30471f03d32d63eca30435473
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The PDF also contains numerous external URIs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb741a735---45594187315.pdf In PDF document text
    • http://nakloboucku.cz/uploaded/file/13710364189.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94c375239---vililufudaworokomemixo.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/ralumakotuzuzorufe.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/46694386229.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/mituvirosufasamilalobewir.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xinojojeta.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/5105405419.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/tuxevugu.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/62924878466.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/36330296690.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/50086040288.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/wanineli.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/89021943691.pdfIn PDF document text
    • http://vina2002.com/uploads/files/26568556272.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210905035847.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/28346605260.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210916151746799870.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/burilogifiwirixexi.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/rizuzowusisegam.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/3131713698.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/80416840237.pdfIn PDF document text
    • https://mytopics.it/uploads/file/ramafimilijekogik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cheat+coc+no+rootPDF 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_off0000be52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE52 10052 bytes
SHA-256: 5caeba72a7695012322d2832c01d4f9d8662b679f2b33dbd35e23a85abf3cba4
font_01_sfnt_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 17408 bytes
SHA-256: bbd06de9bab3608819074c17231583f000976ad50330f49549abbe84512cea4c
font_02_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1