Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bfbbade465896b…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 05:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5ff2c839a53e1941b9f4df3ca53a7b6 SHA-1: 613af2e7321fedb0530b0eb667ed03378b7d768f SHA-256: 13bfbbade465896bfa11c93375196ba55bf26209428e45f982423eefc0e50252
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing 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 initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=cars+2+ps3+download
    • http://annabarons.com/files/files/22987081860.pdf
    • https://bitree.com/ckfinder/userfiles/files/7821378801.pdf
    • http://hnsunnyfood.com/d/files/vufewarajisexusekiluzaso.pdf
    • http://consade.com/userfiles/file/pisojunaxesurebamo.pdf
    • http://profiklub.sanswiss.cz/files/file/33560337340.pdf
    • http://rooptex.com/uploads/rikagewisufebunusaledira.pdf
    • https://marlschuz.com/userfiles/files/47861819625.pdf
    • http://deshdunya.com/blogimage/file/91824618056.pdf
    • https://lbk-ingatlan.hu/uploads/file/27603895433.pdf
    • http://arenabilardo.com/data/_files/63424303552.pdf
    • https://hum639hb2-hh38.com/contents/files/80164514678.pdf
    • https://specialgarden.ro/userfiles/file/49831248959.pdf
    • http://gocep.org/data/userfiles/files/fegibe.pdf
    • http://gsprojekt.eu/userfiles/files/xibudavetatogukes.pdf
    • https://kipass.fr/userfiles/file/81065279944.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipokomixemazujonoraf.pdf
    • http://futureinfashion.com/ckfinder/userfiles/files/jukepixanezusovig.pdf
    • http://all-vehicle.net/js/upload/files/xatofazosimekowuvinunesoj.pdf
    • http://pronobile.de/catalog/file/vojopedibonuzisoguwit.pdf
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/tamokexevirikuja.pdf
    • http://malabarisproducoes.com/arquivos/files/87053201336.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/41678397368.pdf
    • https://viadagio.be/userfiles/file/39904249574.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c44b89399---pewuwigebibagesutazaze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b09a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB09A 16792 bytes
font_01_sfnt_off0000c8ac.bin
26a87127391515b7f8b53d950a94b641c176c0c661e6406d5882cb5970b520bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 15412 bytes
font_02_sfnt_off0000ef6a.bin
55c0d799b167858f45f6300816dd5a87c8f11e19ae4761b129eab0f6d4cd6f61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 10472 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.