Malicious PDF — malware analysis report

Static analysis result for SHA-256 113c429e848a721c…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 23:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bb75ea8710187fdf45cf206c542f96dc SHA-1: d572aef1ebfcff38ec21f5fde9728638c94e2ebb SHA-256: 113c429e848a721c483f4034cd667522bd70fc33b7b133302f83ab457d150116
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing a link farm strategy, suggests an attempt to direct users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://actybrain-consult.com/Upload/files/xawaderovubekipadelisitir.pdf In PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/13965061205.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/17550107401.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/4190112999.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/71049086874.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/xomodexexoxerivixexiwot.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/voxalud.pdfIn PDF document text
    • https://invision.buzyhub.com/files/rudametiwelix.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/35100873014.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/lunofogojiboluzujiva.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/puwubedejipabidipurew.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wikatibosoj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141360a63521---wavoj.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109080127044474.pdfIn PDF document text
    • https://combrooncom.com/contents/files/51490328464.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/roxusodumavosejapera.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/2898748023.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/midogegafen.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/60479491683.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/vibasilijutavatumaxi.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/99056223576.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/pilunagorafumuwizoke.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6318f92e---10285418739.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gefudamakubunul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=we+do+agreePDF 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_off0000b0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 9908 bytes
SHA-256: 8af12cf5c6eaf769383fa435002eea78613e62749c576c0c3ff3a15792f2baa5
font_01_sfnt_off0000c66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66E 16600 bytes
SHA-256: 2242dc5e828e2631730fd444edd3024e07c671ed036c87fa1dea18fb5caafc53
font_02_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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