Malicious PDF — malware analysis report

Static analysis result for SHA-256 d544b7d6464c748d…

MALICIOUS

PDF

94.5 KB Created: 2021-09-08 21:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28dd188907af737cb5957614bb448a96 SHA-1: 2383f04b41558c69286411370d2ecf252a04de63 SHA-256: d544b7d6464c748d26add8263ccc3f98bb4d06af2cff7efda1129821d2958638
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, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/zanumezoxiginef.pdf In PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/25340149976.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f885ee318---koguzesarapofoka.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/14744637336.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/xivupax.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137936b7c171---vorojilobizovapesab.pdfIn PDF document text
    • http://selidbe-beograd.info/files/ximijivirovuleziteloge.pdfIn PDF document text
    • http://www.bandungmesin.com/file/buwoso.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/7714653640.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/rovojodujekofefirifanugo.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/87337964511.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/73890327450.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/8964449153.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/mejijawumuzezefidejo.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090622553973499.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/letibutelujamovo.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/11458012009.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/zataxapatodowolobikulo.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/bulitajoxelabisiliguniv.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/wifugululudopedi.pdfIn PDF document text
    • https://birotex.rs/images/files/32921455500.pdfIn PDF document text
    • http://podarox.ru/public/files/sewitadazonuzikim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=foster+freezer+lr150+manualPDF link annotation
    • 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_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10728 bytes
SHA-256: 75de2578f8e1a589813eb900e9fcc2bb00c2888f794505361b9c67dff472fab1
font_01_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 20208 bytes
SHA-256: ba0c8e2e68935e875453ee5da16d82830e5376d7a49185818aef95841ba8eef6
font_02_sfnt_off00015475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1