Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c83e116311db5a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 21:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74ebfc44cf8c2d92a895de9e726a087d SHA-1: a12af21bc3970fba4d3dd4ef1289551e379d4cb3 SHA-256: a8c83e116311db5a570f87c9d2acff3d863f1ed8ec98fab1ef7dac28db85dde8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous links on disposable hosting further support this. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=mx+player+apk+download+for+laptop PDF link annotation
    • http://sztarmedia.hu/_user/file/bakexaziwonusedemodoz.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/63517da37669a858a0ffcbe97044b90b/97009187597.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/wirarokujilijopu.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/mamovijukud.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905114329.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/viwedonipomojodope.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144989283e39---30524057964.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/83206010919.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/44345738703.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16143640c3c94d---98563143172.pdfIn PDF document text
    • https://armenia4d.com/contents/files/vilezatokamamosatiroti.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/kufuxelurebepufusabinutu.pdfIn PDF document text
    • http://info56.ru/userfiles/file/tikakogalujazixatavusapun.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/siravawowunanu.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/181200408478.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/97093335946.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/7358727820.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/92915400848.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/ribikor.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/23767910729.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/gukuwo.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/suvulanowuguwisebowa.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/miwokove.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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 18764 bytes
SHA-256: 9b51e5f82c255f006fe8c8d523127d08826ab2e256b495aae02bcb2ad14a1bb1
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 10616 bytes
SHA-256: baf54f788a537e7ac3d3cb096038837023b56d43905291b3da0f086197480569

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