Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cb933286821462…

MALICIOUS

PDF

88.7 KB Created: 2021-09-11 07:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f23a0c5ed6a6a991b0228eea6b75db2 SHA-1: db01352176e79a316b488e69287c5ab8582e5e65 SHA-256: b7cb933286821462b2ccd676b805ee0ea2505a4b339324755047fa5b39474b06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting and appear to be part of a link farm designed to redirect users. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=modern+family+watch+online+123movies PDF link annotation
    • https://speedwayinfo.hu/uploads/file/24891947811.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/kofokinesepagomimaxorun.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/3332359685.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/nifujabokerinafujavedako.pdfIn PDF document text
    • https://revive.fashion/upload/files/luvikaji.pdfIn PDF document text
    • http://furniture83.com/upload/files/lenaxadavujakuvejusobudo.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/suresarusojujivup.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xolijexejumolosazizak.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/27711231286.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/devimo.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/gadanelixizowekadibaja.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/79076758941.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/tivekotavewonakewakab.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a724c35fc3---bipaxadonesedevazisutali.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/wabufafamopokasaje.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/2293952385.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/70082958859.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/20690381644.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/fosevafevebilatisitamida.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/66413098273.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/71642980550.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/noxulemipojikiju.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6193d9fe1ca224fd08b812f213006c5b/66981333367.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_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 11344 bytes
SHA-256: 5438b54cdd88018de8fde45f36f928707802ecea39e83a90167bddb9d552f457
font_02_sfnt_off00012833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 17596 bytes
SHA-256: dad10863188cee29ee3b9834c7d818f1813342f94bf006a818cc267b22a1d2c9

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