Malicious PDF — malware analysis report

Static analysis result for SHA-256 d575eb929c1760a2…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 13:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 77360fe714a015143877ad0963f33295 SHA-1: b7500634179f5edfd64ffbb9b1cb47382630d788 SHA-256: d575eb929c1760a254ac8beb0c054fbc7f33df8d56ecf2e5d65d3b9e54474824
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous links pointing to disposable domains and a link farm heuristic indicates a strong intent to redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://gtselect.fr/ckfinder/userfiles/files/wudosiji.pdf In PDF document text
    • http://lunaleo.pl/userfiles/file/71619026022.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152fe3023e3c---90156387196.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/90212118787.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/78274510638.pdfIn PDF document text
    • http://esipro.be/userfiles/file/10727116469.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/22225496997.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/55966108486.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/47786676832.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/dojek.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/72817781671.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/60631032884.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/88468894749.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/56582039779.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/33233866414.pdfIn PDF document text
    • https://brukspec.pl/upload/file/68767189137.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/zusemebib.pdfIn PDF document text
    • https://ambalatender.com/upload/files/13215759537.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/30391703804.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/sazodisa.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fokovikajikoxixor.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/mexuvugakexinak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+not+make+conversations+dryPDF 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_off0000addb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 10836 bytes
SHA-256: a1ec3cd5541506a281adb96a2d86cdf3c58e69761e6de8cb2708dcf2cb6fd7cf
font_02_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 15860 bytes
SHA-256: 727518935b202196af17eac60d6072ff536505088df422700e23c6e98c3b1b58