Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f6b753e66c3744…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 08:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c3f13173f9e621191efa312a906fcf1c SHA-1: 4bed84041d87e2ebd824176cd0797d6ccad47748 SHA-256: 12f6b753e66c374401c17780836e80b7c5edfefcf6f801df2fb40d78b400bbdf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, likely for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall detection suggest it may leverage embedded JavaScript or other exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://santchavarabed.in/ckfinder/userfiles/files/87548772332.pdf In PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/ladiluterol.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1aa580c10---36543633370.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/jilikijugekodavemuzesus.pdfIn PDF document text
    • http://normel.org/files/upload/file/pobotitafugijatafuditot.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/tiwev.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/96756007311.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/juregof.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/fofobugiwefekumuxuruvabak.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/23641748960.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/jeferipopupotedo.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/17892753165.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/32262881072.pdfIn PDF document text
    • http://classtool.info/upload/files/rivam.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/zamepakigakimokuk.pdfIn PDF document text
    • http://hrudolf.com/userfiles/wokukoxor.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bezuxejuxilarifopale.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/63514186981.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/6348018713.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/99750894680.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/fikipajavaxizosizixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+impossible+quiz+answers+unblockedPDF 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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 11268 bytes
SHA-256: bb0998e66c90e515b9c3c1d7ab23293944c0357e0adadc446933f491450bb834
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 18496 bytes
SHA-256: b83357b6a2ff03c2513432b0b0d61a7bbd479c5476e4ce3c2221bbeadd101a3a
font_02_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1