Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b6e7a8c6222801…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 04:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4061b08de9627f09a617e642feda6d24 SHA-1: b688ca70067d3b6fa3ceba9bab3ae80be538b19a SHA-256: 06b6e7a8c62228010fd3e635cf7698742e5934ac8da359de7af1a1422926fb3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/uplcv?utm_term=android+get+app+package+name PDF link annotation
    • http://dentherapia.hu/files/file/kavunuxuvum.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/8760552038.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xorajewovaxe.pdfIn PDF document text
    • http://eternaseguros.net/files/files/22465492300.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/megupiwodupege.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/81598438511.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/88949888348.pdfIn PDF document text
    • https://termoformat.md/img/files/kuronozuribafo.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/regofapina.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202198_134642_294.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/32941945369.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/pagiril.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/829962897.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/nobesipon.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/70590551984.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a9d6fd06ab119dc459f2aa25fcc153fb/40513309893.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/nowerifegixarivaberulek.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355836ac864---77327497488.pdfIn PDF document text
    • http://gerocuki.hu/user/file/85190984038.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/jivume.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_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 10716 bytes
SHA-256: 89f491f9def6e0d588a09ef38627a87a1cf72c605da0010d966cf2677aa9d6cf
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 18056 bytes
SHA-256: bbbc12bc110205f3f8d8a92097ed8b8481119a80a332618983097ced54a925b1

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