Malicious PDF — malware analysis report

Static analysis result for SHA-256 b940d5df97fd6963…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 13:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63e749719b73cb19cea137adc4567b38 SHA-1: 03ab57f9b22f12b87363727a30ea46cdad83c066 SHA-256: b940d5df97fd6963fe2e7f4ddbb7747ad0a9aafc35d472381311ebd15097707b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URIs and the link farm heuristic point towards an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://corkpotters.com/images/buvomowe.pdf In PDF document text
    • http://epmachine.ru/d/files/73119365556.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/pisawif.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/jepazapuriboxejesudabojig.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/kikoduduzuvugapazexema.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/gesenaf.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/53530303477.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134a45fcc5f2---vorededijuma.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131020d59e8d---34727735064.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/8380801218.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/xulod.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/pagikafifitifadimezurego.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/82131809358.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/sajagufefeneza.pdfIn PDF document text
    • https://bachson.net/upload/file/lexijabigutofomajujenoxan.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/57658009190.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/kevebuka.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/sufitem.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/32039200482.pdfIn PDF document text
    • https://andhimazhai.com/images/files/2361741242.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/kuwipowaxodawerumesu.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/70364015449.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/23973402446.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/31548054362.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/bazugedafejideruginuzap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+apps+for+rooted+android+lifehackerPDF 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_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 10864 bytes
SHA-256: 536fcb12af2ecc084d0a9a8e9cfdfd4eb966b3be2af39b1d7d4cead73ccae8d1
font_02_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 18272 bytes
SHA-256: 310dbcea2823aa066a039f379bbdb369b14b33530056dafe6d97ccbf310bc0b5