Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00d1fab46809149…

MALICIOUS

PDF

89.5 KB Created: 2021-09-13 20:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 867d75dc258f71da220e942fd6f403bb SHA-1: c327444b77ca758234335facfc97524a457205aa SHA-256: c00d1fab468091491f83d6191b036a1bb5beb4dba99ec5eb688a17523944baee
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 a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malicious redirection attempt. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting the document's primary purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/futaj.pdf In PDF document text
    • http://diagcorlifescience.com/attachment/file/84965865919.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/38724406842.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_152152.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/nuwemozuloki.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/24206183796.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/70011594021.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/5459143644.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/91762276263.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/92570980245.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/17997494609.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/mosusasos.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/fuxefizev.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/xolopi.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/49117513866.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/20199834322.pdfIn PDF document text
    • https://alohasafaris.com/files/limigoluxi.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/xozisokudiwidi.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/lexogupikar.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/domibesabuzamo.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/30036446331.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/mibilur.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/87345829366.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/81418440064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=conjuring+3+full+movie+watchPDF 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_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 11200 bytes
SHA-256: de24d0ca237038611d3d5fc9268610279b85841d7598039e4cb189bbe28909b6
font_01_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 17740 bytes
SHA-256: c718bce6267381a89f98503f3b0ff0b71a10c8a90ad931d48721076524244daa
font_02_sfnt_off00014016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1