Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68769e657093b99…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 18:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8029921d56cfb52bdec50a95565dc623 SHA-1: 2a002d33530699628d2fee3e499cdea54c070d5c SHA-256: b68769e657093b99c8b728be942416a0eac774027644d866530e594b5d9b17a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=kamasutra+book+pdf+tamil PDF link annotation
    • http://1-cities.com/blog_images/blog_/file/xilisurufepof.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/29851678188.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/86152413076.pdfIn PDF document text
    • https://dintek.eu/uploads/file/98517731389.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/diwulifubamugujoxuzubex.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/kejalabobilesegigu.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/99966804391.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_80DB74BABB87855E.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/sasadulufomi.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/mezurixi.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/fasenarupumi.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/80386131299.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/99304507499.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/gejomedumotive.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/29804259128.pdfIn PDF document text
    • https://best-label.com/upload/files/73874532021.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/88717382848.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/75874631139.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/72678512628.pdfIn PDF document text
    • http://vodova51-53.cz/files/62224952352.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/dozarazasadezoxeke.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/4838055887.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5003da6ae---lujojarawakixakabonuwak.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_off0000c54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54A 19796 bytes
SHA-256: 20e74b9ab17114c6ece177e6e825a28db1af20d848b7c6479670075cc0720081
font_01_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 10744 bytes
SHA-256: 3788a0a44ce27fbee14d313c1567dae9b86cc5f189a474f372d4bfb7230d26f0
font_02_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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