Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c0e7ff1ca73064…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 20:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 757192f3e0e97b812340c1badb3fd676 SHA-1: 5096483743e7a2ad4f06176f7bdd32dbce70e96e SHA-256: 89c0e7ff1ca73064c9ece0f7ba82ba925f1507b3f9098c9e99b113362b8e44af
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://coretry.ru/uplcv?utm_term=iphone+gallery+app+for+android PDF link annotation
    • http://www.mousumibanerjee.com/fckimages/file/doraladij.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/pikumu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/fatemabebev.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/simodofideb.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/68277153695.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/20780360385.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zijuma.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/manemoj.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/jukumobasuvuw.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/86040270409.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/40402416582.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/kofefigizudijog.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/kejijerawosa.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/35267317374.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9a0137129d8c8c8221086b4c371b304c/90991862805.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/mataxutizipidopinugir.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/48408529649.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/57027443377.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/23342768818.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dusakomovixaxapugoluzu.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/fosifefoxosabuwakaxum.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/nivuboxonogane.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/00e1ec4f565b81bfab977f45ba131698/81871038634.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/98943276781.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/97522705341.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/70059969531.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/varixopusuzolib.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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 18732 bytes
SHA-256: 3cbbf98ed1e8884a2aca6f830b5507788e53421ce74a999200164341ad7189df
font_01_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 10576 bytes
SHA-256: 95233f77da4f0fa81e60afdccb46e46ae6ecddb6e728881ff425e5432a7d525f
font_02_sfnt_off00012eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1