Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f28c13c75a9577…

MALICIOUS

PDF

74.2 KB Created: 2021-09-26 08:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a938860aa8d3cc3507589d734478694 SHA-1: c7a0c636474268f947390d6333affbd45c9fb447 SHA-256: d6f28c13c75a9577119fac213ab30457e7cb20d2c6caabf0c9e7be3106277800
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://innospectrum.eu/hirlevel/file/kagekejodud.pdf In PDF document text
    • http://saimiri.name/upload/file/99376243658.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/7036240940.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///508472572.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/rabazikurinodexudipabadun.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xojugififem.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/65408526516.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/ganoxutijasusepopelur.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/34866944170.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/28772763906.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/22147804848.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/24363923336.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/vizesetekakila.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/50332920537.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/vizaxaxebopa.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/58215741080.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/76131458949.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/72208548973.pdfIn PDF document text
    • https://digicpictures.com/downloads/55827448865.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135bce13769a---19778776757.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/90391614341.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/92685025098.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/82785067320.pdfIn PDF document text
    • http://home-plast.ru/foto/files/jeteban.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dph0hea0ebbrpodvrkg58supql/pimirakafigawowadujosov.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/gojufamipadopefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+%C3%BCber+pc+fernsteuernPDF 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_off0000b886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB886 18420 bytes
SHA-256: a2455d726e502fd817121153eb28703ea0c8740a2841d26f0869774154845843
font_01_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 10816 bytes
SHA-256: 9f1b2e795e258738f080cb6f1578adeb432489e361ffc105c0f50831b4825e3c