Malicious PDF — malware analysis report

Static analysis result for SHA-256 810321daccccfe78…

MALICIOUS

PDF

102.6 KB Created: 2021-09-08 18:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a0b520a189eb6745cae3eb600bdaf2cc SHA-1: 14731da83f203500832e7201d372fe3619829d62 SHA-256: 810321daccccfe7840eeba9ab1a98f18f8e08415f04e957d3e58e202e8c3d04d
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 0.9961

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://wsm.hk/images/uploadfiles/file/96803293723.pdf In PDF document text
    • http://telekommarketing.com/firme_data/files/44059798504.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/gotuxumu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/47e48bef3c838e2f1ac3ba39f125a8e3/kawubatajokowowibuvup.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa27e9403---43050396675.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/bulifuva.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/vapigoraninufekavobir.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/31331111814.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/45402119519.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/50656507023.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210906_BFBEE0E17794836C.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/nojewe.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/29343460964.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/folib.pdfIn PDF document text
    • http://gaudi.tw/upload/file/wepesarogewadukad.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/64850417708.pdfIn PDF document text
    • http://simonide.org/userfiles/file/35969432015.pdfIn PDF document text
    • http://santeh.md/img/files/tuwudabe.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/34400869905.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/muxaja.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/42923007187.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/jakosejotuladefesin.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/xalaju.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/damijav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=derecho+laboral+colombiano+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_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 19724 bytes
SHA-256: a76cc6bdc9cde2e0ee21bb043d2a01d310cdde0abf405ef1d7f80565a9f52f84
font_01_sfnt_off00015c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17431 10760 bytes
SHA-256: cac1c1d66efe130373a575998784a1b577e3946276bac64e51e313ab1d9cb4d3

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