Malicious PDF — malware analysis report

Static analysis result for SHA-256 173fd5478e367815…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 00:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3d301a9b6842bbf2dca89bf52ceb27a SHA-1: 50ec9520511dfd0c39945fccb4160b5af156f525 SHA-256: 173fd5478e367815b7164195de59481ce112175c5c67b5a813d9788cf87848fc
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 likely malicious given the ClamAV detection and ML classifier results. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

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://ka-base.no/images_content/file/nonovejuto.pdf
    • http://elitsatodorova.com/uploadfiles/file/negiguvenodukolidunaxage.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/mipedofugamexopitusesoki.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/77052246608.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134230557f6e---duvutusexujilodiw.pdf
    • https://molecult.metallo-tests.ch/sites/web/upload/files/xeriwutiwur.pdf
    • https://inmaabiladi.com/userfiles/files/pataz.pdf
    • http://refpecsbelvaros.hu/kepek/files/zodukopojerofoxisulu.pdf
    • http://lianbang123.com/uploads/files/202109202245419252.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/zugep.pdf
    • https://pharma-tools.eu/galeria/file/jatafewaxede.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/bapifesarelitiguwoju.pdf
    • https://ximangcampha.vn/upload/files/58813598500.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/rerapoviweworaxaw.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-16/20210916043231524531.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vuzeruw.pdf
    • https://12tiga.com/contents/files/79920922315.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/nugagegenimuxa.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/vojopovapebosijufapoze.pdf
    • http://mprime.net/ckfinder/userfiles/files/55341781466.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613025d2ebbf7---dabuvudotuwefibaxafidi.pdf
    • https://hophamthaibinh.com/upload/files/vigabubogeva.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+best+movie+downloader+app+for+android
    • 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_off0000ba2b.bin
64f0576121484e236425491f660bb99d1dec86006a82cd743dc8d87f5ad85ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2B 16736 bytes
font_01_sfnt_off0000e4c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 16792 bytes
font_02_sfnt_off0000fcdd.bin
70a9ec998ee0c9b0432ca001f9147a2f91fd6319cd8fefe03116e0c0565d8920		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 11048 bytes

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