Malicious PDF — malware analysis report

Static analysis result for SHA-256 b886235f3d5df8f5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 11:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b29146784ec272f0fd636171314c3a06 SHA-1: f51a75f8baa964b12eebbbb511f41b14c1f584a0 SHA-256: b886235f3d5df8f54cd09702671ae018d4a90cd63785e9dba802aebd6941c2d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document's primary purpose is to redirect users to a network of potentially malicious sites, as evidenced by the numerous unknown URLs. No document body text was available for analysis, but the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://jocoseatee.com/userfiles/files/jozuvokubo.pdf In PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/vemilatabapefudiriwo.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/lejifuwozagaxawitamas.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/xigipewopevupebetoz.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/wisavizorasonuwiwexulorod.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/4410699922.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/godevowisorefunoralu.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/23237685171.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210907_182608.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/50245206329.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/76642571848.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/55733780206.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/gonuzuxebizikabeva.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/16538424612.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/d3r6vrmj9ucsnn8go8c7skr02l/togefux.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/36416596683.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/24514580924.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/88686743110.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/65996401389.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/texeresonepusixegiboromuf.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/79591928073.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/66864415235.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/8599523213.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/26303937418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=like+a+virgin+richard+branson+pdfPDF 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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 16084 bytes
SHA-256: 41544397083fd976d0392531858829d7bf18adec7992a240dd12f6ef18f10f12
font_02_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 11008 bytes
SHA-256: 802ead8b28ae47710f17a13736c7798c9028a907ba836a3c31fb169af49bdcf1