Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ac9561c2801797…

MALICIOUS

PDF

91.4 KB Created: 2021-09-20 15:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38e43a3692eaed7125a3208b006a0a4a SHA-1: 1cb592783194431a9f69f3ea58dd8009372bd510 SHA-256: 89ac9561c28017972d291ff618ade29da3cc781f60569ddf9dc98826638874fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://garnet-medical.com/userfiles/files/54586195644.pdf In PDF document text
    • https://wangwangcamp.com/uploads/files/202109190447376578.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/27771563045.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/bipufakub.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/romawikalotedux.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/musasojovasowevutupuzasuk.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/lulodezamotir.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/4426980934.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ol492reks9qpah9doc05ql7e37/lopul.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/pixejupeduwejajerox.pdfIn PDF document text
    • http://prestopc.it/upload/file/92345076957.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/62930384811.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/9641257630.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/lazopaf.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/tuwutizawodotepepefebifa.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/49832654990.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021092008004173499.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/munexu.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/soniwo.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/83511967568.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/ripunimepun.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/73634483595.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a79641adee0fbd9649129d75d3eb6eb4/6274425152.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/27876940812.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/pevemalojip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fortigate+dialup+vpnPDF 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_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 10544 bytes
SHA-256: eb8dd44fb027a6e457ea95753f5e282048e844c98c37d864157a0395a5825c3c
font_01_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 17856 bytes
SHA-256: dfea8ab181f5ba16410cafcc3a3f9e1204a74f56be1689e32ae1815f3a0a2030
font_02_sfnt_off00014859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1