Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efe1b252a21d9fc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 22:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1f9e16fdba4bc0af73fd00ec0f170c95 SHA-1: 65661833247adb8be5b6fe0c3023116ba364cf53 SHA-256: 7efe1b252a21d9fc1779cc19e32f14eb5d4be331772d37de89d6c0c5f87502cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613551de5c886---39229864931.pdf In PDF document text
    • https://tessuno.com/upload/files/613143724a195.pdfIn PDF document text
    • https://protum.se/file/19625361468.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/pixote.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109030610025362.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/vevubosozapozipofokugib.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/38406178096.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/6878063633.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/88846638734.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405af8d637b---wonimepuroz.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/nuteruvesopabutisero.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/75573181212.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/zagevuminizepuvatesofa.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/10015982527.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/bawifoxe.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/wejozilej.pdfIn PDF document text
    • http://allier-genealogie.org/File:/zokufuwaxonot.pdfIn PDF document text
    • https://duel.pl/userfiles/file/kijilajewadanitagaxuz.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/11097413295.pdfIn PDF document text
    • https://betsin.org/userfiles/files/58623555231.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/podakewilowefolovin.pdfIn PDF document text
    • http://arucax.am/user_images/file/loraxesunetisusof.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mavegazolode.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/56493599120.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/vorim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+walking+dead+11+season+onlinePDF 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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 10524 bytes
SHA-256: f1d84d24040191b46fd41088cf30a2de572a9aa4049b3ddd85d8a4eb6c1b1e4b
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 18456 bytes
SHA-256: 5ab26467bb441f6bc26d8590a3e6c1761ac51e6d483d9806d3397b9376891bb4
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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