Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8e78b3c6529c7f…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 13:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94353a2328bc035cb50fc251092e2ade SHA-1: 75110d15f13ad285893e727cbde401c5db05c2c9 SHA-256: 7d8e78b3c6529c7f5ff4ee6ffe34b258e70a0073ab79712df3d6118d92d44c70
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm hosted on disposable domains. This suggests the PDF's primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://valsadindustries.com/userfiles/file/19728011993.pdf In PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/folerunumije.pdfIn PDF document text
    • http://kmjjt.com/uploadfiles/file/010403485048.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/bavonixigerob.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131979a8d30e---61736802094.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/fitosukuwowarogibuzopo.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/78282837623.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/dozakuzu.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/wosobodebiforatowadumeva.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/lepegubevu.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/43523758218.pdfIn PDF document text
    • http://falconltd.pl/cache/file/17508585359.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/19329494812.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/bixezasoxowusutigopiboz.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615594fa55dd5---jigumovurutut.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/79043352123.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/48216851123.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/6636200187.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202110020124252598.pdfIn PDF document text
    • http://dentali.cz/files/files/vedilogu.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/42244790818.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/pebesusokukidaredinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=septicemia+in+catsPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/19949097099.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_off0000ad4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4D 15408 bytes
SHA-256: 5ccfa879e99356cc8fc73ad2d42506d2d031f00b41fb99d6b1534bf8faa19efd
font_01_sfnt_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 10344 bytes
SHA-256: 5e587e37644d894d7612fb9965fc189d4a9a0285b5d9d632bf76ff2c020f63ed
font_02_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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