Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bed136858d5d7e1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 04:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5cca5708f43f07c17623f3fd6c0b5b5 SHA-1: 737a6d27233e84afab4b24f7d571b3bd2b35e252 SHA-256: 5bed136858d5d7e18d365925a3dd6ef3c42100ffa3b0266e633f35611a5925ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=how+to+clear+my+internal+storage PDF link annotation
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/53644216249.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e2dba544---36119927961.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/25242778600.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/46549677384.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/90534034033.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161360340bc618---62218187087.pdfIn PDF document text
    • http://iccarrentals.com/files/file/90030633223.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/31676087046.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/84903360468.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/basegagasusekefa.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/61076761097.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/leliru.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/82219998516.pdfIn PDF document text
    • https://eurotig.ro/file/zevow.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/dajujudamepegazovukipidij.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/20646046955.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210911031245_104241.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/laxexaxusom.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/jetakewepavavorogem.pdfIn PDF document text
    • http://dezis.ru/uploads/files/ritobogigowapaw.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wapinolisizozowi.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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 19436 bytes
SHA-256: 132ddd8a309918619c360bb77e997b9a278760b256fb2a7610abaa0ac795d384
font_01_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10764 bytes
SHA-256: cc6a5ed5d33df6a12ba80b34ef308d77e68e3020fc155fa2ee659475eb1d1bf9
font_02_sfnt_off00011b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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