Malicious PDF — malware analysis report

Static analysis result for SHA-256 693137637f6fd361…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 16:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7bb30a86399121eedfa712d82917ca38 SHA-1: d0aceb63e61f0ab5bf4fa012fcbf6511477b4b74 SHA-256: 693137637f6fd361efdf9e6b509f3ffd5895c59ef9f86009acbbeaf304418ecb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2a26ced87---jilonafute.pdf In PDF document text
    • http://ok-poland.com/userfiles/file/jadugosofitiwen.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/21242078217.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/50860194911.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/12275984479.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/wegevusatobugibadukegi.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jojepitimorelajinigeduno.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/zeduvesodimek.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/nanatidukojizajeselivezin.pdfIn PDF document text
    • http://ha-sine.com/d/files/48638082665.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/solomunako.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/6532225368.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f8500d4e---11705411818.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210901_102801.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/mezidiratidozavikasod.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/kiturawadogogeral.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/rakuromal.pdfIn PDF document text
    • https://brod-plovdiv.com/images/21059691606.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/47717244023.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/tuxozikimu.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/seripukegazetubebel.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/pizigibovulawa.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/84351024893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=buddha+live+wallpaper+hdPDF 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_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 17020 bytes
SHA-256: 731a8331560bb8ce697a5c4528464ae5a7ef2fbaa5093db93331852e9ce62167
font_01_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 10304 bytes
SHA-256: 0c7c2e4b243379cac1a55f8fc92bc95019d1c58d71716ada5a8ead730faae66c
font_02_sfnt_off00011596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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