Malicious PDF — malware analysis report

Static analysis result for SHA-256 b505952a2fbfe662…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 03:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: adb8d4f40f06fb67f1c07b13f7351060 SHA-1: e16880ec1d10ed09da29fd916de4965940d6fef4 SHA-256: b505952a2fbfe662d5caafd11dfdb2c7f3c954bff326ce64ceff98a3328ca5cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a link farm intended to host multiple malicious files. The ML classifier and ClamAV detection confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rajatotogroup3.com/contents/files/93274815230.pdf In PDF document text
    • http://makesomenoise.hu/upload/file/7666040021.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1dde7864---79579557929.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/32417031507.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/74318918876.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/jotalozidipunemepi.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/60465915183.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/rigowuzubogoladesuje.pdfIn PDF document text
    • http://esteel.my/userfiles/file/76984640025.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/kixakizepurikiko.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/85103323750.pdfIn PDF document text
    • http://santeh.md/img/files/58215229162.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/nexometusomalagunemuged.pdfIn PDF document text
    • https://flomogroup.com/upload/files/zozusikazazamanawadapizon.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/93443075966.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/94640861739.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/vonigevaviwusidawu.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/22847483834.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/42768741570.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/kojejitelovokeviti.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/rejakafubupimulafovowaz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0439d90f8---85195288471.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/42053279964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sim+empire+apkPDF 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_off0000b638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 18004 bytes
SHA-256: d6594c8b051eeb01466b9afe12f9ae9a9d5ea5adc80242393727594bec4fdea0
font_01_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 10044 bytes
SHA-256: 419a221331849a37c9bcdbc94de6b83f9f518aae2c037207d800a6f8c85ea70b

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