Malicious PDF — malware analysis report

Static analysis result for SHA-256 673a90b38dc3f1a2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 12:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 577bd50bdbc25198bee6c894d2543e64 SHA-1: b40d1a9b79d86081b0064983f17206545e5bd76d SHA-256: 673a90b38dc3f1a22541b6a1a33b404af420764252230a928bd22544e651b04c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jck.ro/userfiles/file/71799672053.pdf In PDF document text
    • https://officialbacknumber.org/editor_up/xajogesaziluguratabufijij.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/xisufi.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/24778207803.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342a01cd45---gerefabobopodawat.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/tikilabigodotulepob.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161364a82c5af8---fifiliginiva.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/ximumisakube.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/92364336108.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/maxaxozowovim.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/bigopomuwu.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/vawamaxogusakasutemabewo.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/52591825671.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/43938401661.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/remulalewuliged.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/44531559189.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/sexilelisope.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/xabame.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/78559615826.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/36948923957.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/fujatakofujoxe.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/xaditamagiletuvekigiwep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mortal+kombat+unchained+isoPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 18564 bytes
SHA-256: 88c9a9df93261ae145b7908dd3b8bf15457bb82cc092466e3be14c73db8073a4
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 10960 bytes
SHA-256: f83a2b54de5e8a413c7102d139225b68ce7712c552be74655ecedce0fbc15b5d

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