Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcabdd96eaf109f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 23:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f5920c448138d196261d16a323dfd17 SHA-1: 3387901db80805ed6a7d7a93d13c37b4ec4dea29 SHA-256: bbcabdd96eaf109ff2cb508650ef830ebfa73ce34ee71920fbf7a6f84c627964
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maybaobidinhdinh.com/upload/files/2658245765.pdf In PDF document text
    • http://charmingcurls.se/upload/file/lodeduridedalikerazo.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/98533710361.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/rusonegomafaxabegomivo.pdfIn macro / runtime command snippet
    • https://ylwlgwadmin.ylwl.cn/upload/files/radukuzebikov.pdfIn macro / runtime command snippet
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/4288312034.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/lejeb.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/53268005474.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/risipenanogosel.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/38140435995.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/tesitofetovolapu.pdfIn PDF document text
    • http://dsraxys.com/uploads/walubifeje.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/83600733843.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/51422612622.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54642630465.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/tenorogojowar.pdfIn PDF document text
    • http://screen.by/images/file/sapurofomaviwik.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/54373526941.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/toziwevefemefadodor.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/jerojuwivamex.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/21754966072.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/499c763d7a473e51825a883a9547eed4/91782860015.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/csbln9h31jtmrv6h2c6l71l452/57159011059.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/lusatinav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=desiigner+songs+mp3+downloadPDF 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_off0000b2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 10896 bytes
SHA-256: c6da1c853e13e06f27ec0e93605bf2a7a77349962004caeebc1023bf17da1a33
font_02_sfnt_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 15808 bytes
SHA-256: 27df437f01ad071f81ef45dc9451509ea902d17171d8b667d7a51e29e9f88057

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