Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fe999542d9df93…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 00:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c71762c35d8eee0e83341b367d7666a7 SHA-1: f3bb87e8dad084a8dcae33ba4191529e6507d59d SHA-256: 28fe999542d9df93ff5ffcad72174ab8fe0cafaa3fcb12e14a3bfbfcc02d7e71
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or downloader precursor.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=mayukh+chowdhury+comics+samagra+3+pdf+free+download PDF link annotation
    • http://boxethai38.com/upload/file/movorivawutusifisif.pdfIn PDF document text
    • http://getdol.com/page_data/file/munigere.pdfIn PDF document text
    • https://gencatakan.com/upload/file/93888695687.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/84340951769.pdfIn PDF document text
    • http://rapet.hu/files/ropetadapazixomugikewupuz.pdfIn PDF document text
    • http://donghotam.com/luutru/files/87190925291.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109092134596290.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/24927978957.pdfIn PDF document text
    • http://innotack.com/userfiles/files/75070538073.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/88074361445.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/6189403839.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/92579871969.pdfIn PDF document text
    • http://edeins.com/userfiles/file/jotigoj.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/vufaxe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e41e457d---36311277942.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/41467575040.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/bilemodijifunenemuxitijog.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/61383459104.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/kozaxafeduzasetuwebimuze.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/mipavedifodovaladet.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/73420696313.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/64560910165.pdfIn PDF document text
    • http://bdn10.cz/files/file/24873968821.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mc2p4mkgqd09bsr31r6pdt0j40/mizulupuwejuzajedok.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_off0000bdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB1 11524 bytes
SHA-256: 19f076024c3fc6c4c37f061e303e089f572f047e81bf84c85a4e2472fe01eefc
font_01_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 21224 bytes
SHA-256: 546ab027c9dbfc666d1f385fde98e32c1a91e3a7dd437f811c4cd478c7708d36