Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9201d40b5434af5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 01:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35e3ed62bd85823d07c75b8fa5360e58 SHA-1: 29478031da82d54cfdcd5bcc83f3e9b6cf49563f SHA-256: e9201d40b5434af57ba0f418292fd6cbb955b80441ff118ff898189e2632db82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to potentially malicious content or phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=pes+15+ppsspp+download PDF link annotation
    • https://xn--z4qq44i.tw/upload/actfiles/xovatevojujububuwexefo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613034648e720---vezozemovaviforir.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/84353954447.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wonirusozo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614459d84aa11---48176895612.pdfIn PDF document text
    • http://mamitobe.ru/files/file/fewura.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/27491183016.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/gazuxibu.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/fexubinuzotigaxamika.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/92003777879.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/davimuvuwepi.pdfIn PDF document text
    • http://tai-group.com/upload/files/28174418782.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/13084507688.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/27299758867.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/97682145559.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/tidokasa.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/48291113880.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/47983673780.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/xepijup.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/84030746744.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/25376813142.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/poxoxilurilenekefixireti.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/sefavarevogudumogi.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_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 18068 bytes
SHA-256: a8ef1aff0d2a611715e1377c1f4a3d27d0c6c4117d28e96f658a8cefab813465
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 10368 bytes
SHA-256: 1b6a587baeb00579bf4e6e9dd19d5e12e5f4a5438edf57747bb5a115a0469360
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1