Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a958f58d472d22a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 20:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c958193da535afe42827f1bdfcc65602 SHA-1: 8a07075fc62df4b87f9d761365bc9a3a1f39c3a1 SHA-256: 8a958f58d472d22abcb2079cb09ec0ff6c3fb6faed6577fbe98c2b04185a437c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM. The PDF contains an embedded JavaScript stream, indicating potential for malicious scripting. The presence of numerous unknown URLs hosted on potentially disposable domains suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7821a520b2edfecee9e8d022de83dee5/mavuxufoduru.pdf In PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/82510068481.pdfIn PDF document text
    • http://twilaw.com/files/files/nufuterutimasujalewonita.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/zanakifabunakol.pdfIn PDF document text
    • https://cncunse.com/d/files/14890428314.pdfIn PDF document text
    • http://nineslash.com/user_file/file/13369693690.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/mexipuvo.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/viwozisososafobopovi.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/94943185113.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/rozanijapekomurolejod.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8045a27e2---26898617182.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/25974669066.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/foterut.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/48864491593.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/59164986305.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/80677402368.pdfIn PDF document text
    • https://cooperspick.com/files/juguman.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/10733808428.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/pimawigubodujizotal.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/malavak.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/pefabo.pdfIn PDF document text
    • https://nasikampung.info/contents/files/35860813661.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/13902948380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apps+to+draw+on+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_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 17276 bytes
SHA-256: ec8dfdb1969d1f1651077288a690123ad0bfd84e03d56ffe756ded40cbb87aba
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 10272 bytes
SHA-256: e5c2f159cd7c89be899c7ad1d02a436c57b8b8fba4b80babdc24174c0ac18d2b
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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