Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44da1a7e65a46e3…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 04:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac7c65fe51a25053b8fe7b29fdf705f0 SHA-1: da24d825113426ba49cd9eef9e8229ba48a2f192 SHA-256: b44da1a7e65a46e30dca7a7cc1e421cd6680e4fa84d709457bd4ccfc1941a4a7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/375320a3dc3dd347730f133c122891c2/72609027969.pdf In PDF document text
    • http://jycjqj.com/uploadfile/file///2021090811245269.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/93251153249.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1b289b3da---73265533815.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/mazoketawogu.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/gifabunulanerirozodaga.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/14818389129.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gozotamazofumogexet.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/35921630321.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/tanewazoguziraziwop.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/35538825048.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/64825240518.pdfPDF link annotation
    • https://journalofcritique.com/ckdosyalari/upload/files/vinimupefize.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/dukorojiboriloduzirulator.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/33999010028.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/kitaxipitumunojabijikesu.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/tugake.pdfIn PDF document text
    • http://saimiri.name/upload/file/laxarewedokovomasalula.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/81691021210.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/10455152888.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090920324824.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/72272870513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gta+4+beta+androidPDF 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_off0000b082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB082 10284 bytes
SHA-256: 178a7301b490c95ac3833d2b93e6cb7151b020495a42d0ee5256e4f419c38522
font_01_sfnt_off0000c7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 16268 bytes
SHA-256: b0aa09fcd6f341d51b84709113581f3a9e26e8a864741023be643c03e2d95e02

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