Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d41ba1b02983732…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 05:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9540b75d18ba5b03d06d764c1646f416 SHA-1: c1d482ccf6410a57a9f840c89a622e3b33fbf8f9 SHA-256: 3d41ba1b029837323d9a6832717adafac82f0db7ed3610ac21584a2473da8504
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one that appears to be a lure for downloading a file related to 'Call of Duty Mobile', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=download+call+of+duty+mobile+apk+obb+offline PDF link annotation
    • http://energy-labels.nl/userfiles/file/riratenokurarufivoma.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jegitajifepipojibaperukuk.pdfIn PDF document text
    • https://tebra.si/userfiles/file/jezamegikozumefora.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/32071141336.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/gerumeduvelipipanatobarob.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/43096577863.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/99147173032.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/59591875081.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/xegaxumasagudu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mifuvodapeke.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/62474436330.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/nagalujabizexe.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/girapigotaramidewez.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ca84fa9f4d5ad0da8468e3d24ae533e3/ripod.pdfIn PDF document text
    • https://birotex.rs/images/files/2650835409.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/kotifunaxajutowet.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/befugikupijeromewowimo.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/tedofikeledaku.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/65635601931.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/61455888767.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/fisiwabunasewak.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc2fdf5de---taligejixel.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/nibugexilozej.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/7506258448.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_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 18104 bytes
SHA-256: 6fa0d3ca5303c4c4dcb87c91f53be43d62b74d834846a73ab095984fb62ab3c8
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 11048 bytes
SHA-256: 1596bd9735b2cb67570da3501522448190c607dbff275b89573259a4af27544b