Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8c3b1d246ecf4f…

MALICIOUS

PDF

77.8 KB Created: 2021-10-04 04:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5e560eff215dad7547ee098bad984cd SHA-1: d656b42eaa7c77a71f0b6b749457e8aa3293c043 SHA-256: 7e8c3b1d246ecf4fe911142f6bf9d8489deb051dfa334eb0ffad1769924c848f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sealand-pptc.com/userfiles/file/fuwowuvujebaja.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/681b47b9cb51125f490459d5c4b64d64/34665168925.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/31208338995.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/muduxojalexabefijijipigoj.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/jonakofewotob.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/pifafaz.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/14196182608.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/pelofedizuzolomapumenex.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/30595420057.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88222123593.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/89420634589.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/55951161973.pdfIn PDF document text
    • http://etnorom.hu/pictures/76028511694.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/49995412649.pdfIn PDF document text
    • https://estoniapools.com/contents/files/23047808883.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/guvudesusiginaxapeme.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/wupegomunemanezugojaf.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/24921975477.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/68884696780.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/63424233850.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/fazalelitatoruji.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/55230567237.pdfIn PDF document text
    • http://screen.by/images/file/lejeruzosaz.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/24391915484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=importance+of+laughter+quotesPDF 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_off0000c39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39B 20192 bytes
SHA-256: 062cb6b90db13f3188f7779644df4e22d338ed33224635207efb35db51c9d702
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 11032 bytes
SHA-256: e347d9972bee67057d55c9d692e45bf40f63a7c0f8ff723ddda3ec12c42d43e5
font_02_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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