Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce302ee6010c3a6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 12:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e9366493fedca49dff5891330a6b63a SHA-1: d0f71e55d3d3b570fdc733778c44267398f7a711 SHA-256: dce302ee6010c3a6c82f4cc7d0e3dabed96cd255cc024819a64ff5f2d54be10b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload via the provided 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://synerhu.ru/uplcv?utm_term=download+hill+climb+apk+mod PDF link annotation
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/6371760953.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///98211667290.pdfIn PDF document text
    • https://ienter.bg/files/perexaxularepuz.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210914132409.pdfIn PDF document text
    • http://xtra360.net/campannas/file/98589892695.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/subifezoraserer.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161429416acb26---44978136410.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/18891951349.pdfIn PDF document text
    • https://rintrans.com/files/lelibonom.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210917_51B7F7FAE1D8CF55.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/derijazafenuzanutajufa.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lsu7a3unvadv003nh15l9ro6af/73493352388.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/95588786805.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/30155689420.pdfIn PDF document text
    • http://rurisnet.org/images/file/22753044562.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109150730438884.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109021948071799.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/mekopojurid.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///19796086216.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/fisotirekog.pdfIn PDF document text
    • https://akemi.ro/hirek/file/zunozi.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/radapovuro.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/mivogupivo.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_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 10600 bytes
SHA-256: 59ef1a5abf6cf623798b145f78268750e1f34691caf7c4647916c4c92224b095
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 20320 bytes
SHA-256: 91800d50a6123d5dc4483eaf416735a45eb7dd3b10de8108d435f35d069e7740

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