Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11efb22d36b94a1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-12 04:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42eef4300808d2186caadb74a44538ef SHA-1: 5b3b8ca6656900acad1dade42df75a9eff2502f0 SHA-256: f11efb22d36b94a106d1578e3bad47d9384d801c6a702ec9546e727e007bab08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://hsdinstruments.nl/uploads/files/loduzajuzegogatobovusolu.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d2d1c3c9e36a98f69fc4c5c77c07c6d6/33465594218.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/45296893931.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/94444745369.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613504ce64f97---47606204052.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zoxilugatapana.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/39286156033.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/pipulabatarajo.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/85510502064.pdfIn PDF document text
    • http://glassick.com/userfiles/file/xumop.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/wawinotowejijaja.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///71740755169.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/midelokokawukiruge.pdfIn PDF document text
    • http://leguido.net/files/53576091588.pdfIn PDF document text
    • http://moretonassets.net/userfiles/siwifomibudabekiw.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/foseborimiguxamelapiwilo.pdfIn PDF document text
    • http://origo.ws/userfiles/file/35497488102.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/vuxodijudewixawukerexojet.pdfIn PDF document text
    • https://10fci.org/userfiles/file/dipomuwo.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/23c93e0d5011a8d678fc7dc85e56b43b.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/56901872359.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/7852589630.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/98425601877.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/80290160994.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/68255946568.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210905_4FAE7F1828414C11.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=isabella+commedia+dell+artePDF 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_off0000b658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB658 10516 bytes
SHA-256: 4c2804cb1464961d1b1bd92bb6a44caccda7d6275b591f0adde1512eb045acc4
font_01_sfnt_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 14420 bytes
SHA-256: 74facab8f3a538253be0ceab7e9e5a167b64a39fa683471cf97f671c3367e56b