Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c27b8891eeb75e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 01:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 845ff66efadce3b884c4f131d19890e6 SHA-1: 3bd6525233b0803f27117d06725396b970623053 SHA-256: b7c27b8891eeb75e2f313fe4fde5a51680d475bea369334e0db843556f2ddf8a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wyslijpaczki.pl/app/webroot/files/userfiles/file/83868174272.pdf In PDF document text
    • https://pmms-online.com/assets/file/tewenopowemego.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/21943024687.pdfIn PDF document text
    • https://braus.uz/images/shared/file/68315629377.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40659905922.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/29466906878.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/vuvufokep.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/177fd665a9da7ad1223bbdb02dbc77ce.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/23601535240.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/jupoj.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210909_52E0C81AFB4EB84D.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/36112404230.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/86958740323.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210919011718.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/36550707409.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/53745068057.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/zepovobupakepigalivu.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/gixexatejofasanen.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/55934071551.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/juxefetuxedune.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/xemitupevanemot.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161361b28684e5---nafazegexiwif.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/59797946928.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/82282915748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=truck+apk+modPDF 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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 10192 bytes
SHA-256: d7174a0aa46558f88aec2ca9f2071f8fd022b13c6efc681a7ca99a28471f9e13
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 20168 bytes
SHA-256: 54aabe6f554716fb3314b4e547cc5c63036b33ff8d0a393a7cb9967a45e7109a
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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