Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bd373e14ac11db…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 18:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7538bb4d3679edecc53f5fb4fcea4cf5 SHA-1: 6867787b15f92fcdd1cc588d26a05a8903c8d9b7 SHA-256: d1bd373e14ac11db3e9a5e4f8f9abecb5c9e44747727bdb122a2fd376bc197c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. This pattern is commonly used to obscure the final malicious destination or to distribute multiple phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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 http://optimumnieruchomosci.pl/uploads/userfiles/files/zabapifoga.pdf In PDF document text
    • http://alvit-bk.ru/userfiles/file/58363336367.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/15614131505.pdfIn PDF document text
    • http://js-space.de/userfiles/file/5258527718.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/lajudusinof.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/25795567872.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/39682803555.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/mogewilu.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/89655933778.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/bisixurozir.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/wewutopaxaregeta.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/90516981444.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/41886017541.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/44039089803.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/muganokepawuwalosataw.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/novujopidomemukiwemajixet.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/35698061163.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/78144641124.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/4676350834.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/riguzen.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/59280074181.pdfIn PDF document text
    • http://lecostationery.com/files/file/72964589603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=word+2020+pdfPDF 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_off0000b4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C2 9924 bytes
SHA-256: 6bba4aee3aa1b9e6d80f69739fda5417101efca57cf111e81fde05aa05131bb0
font_01_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 16100 bytes
SHA-256: eb747902cd3700f4e427bd5d16e9d375f8faec9ec06ebb8a41d5b97bf413a56c

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