Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76468d3d42a6c70…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 03:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a81b855f68b9b3bd7a85f3150214e22 SHA-1: a5a9bdf321ea6d5239300ff97d4c89d380a5d57d SHA-256: d76468d3d42a6c70b3dac06129e28e3be8f51b500c3e2840ed106eb6909c4498
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ithalattagarantibelgesi.com/resimlerfiles/7690418503.pdf In PDF document text
    • https://eobliecky.sk/userfiles/file/39186575358.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vizor.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341e8959ef7---xizexakowivinesu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161304a832dcdc---berigavudokekaj.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/93921448018.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/rabanagidurupa.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/gilivogotix.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/73371705241.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/rurivivixarugufeve.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/vegedutejalalupukitudewem.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/niniguxapox.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/33910070647.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/rofuwojerunovefurulikes.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/tatepijim.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/70628211171.pdfIn PDF document text
    • http://usmleworkout.com/files/file/bemudetudepolalatekukariw.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/62637059321.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/fazeguwapugapikasido.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/2636559373.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210903193325.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/zipuzegise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lithium+app+downloadPDF link annotation
    • https://b2cdemo.tickets.com/content/files/sisofasefojin.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/67750783910.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_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 10400 bytes
SHA-256: 8ed0a398d24c2aafdb7bab0853e0401fb467f1dbb994308226b9991b0ceebbe8
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 18036 bytes
SHA-256: d821391b198394154ae2b6df7392641491ce370b84bc87459e5b6f68dfca618a