Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b9295ccb1daca3…

MALICIOUS

PDF

88.4 KB Created: 2021-09-09 14:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38ae35985e9827d03caf4b6558574be9 SHA-1: e49534f85dd8ae9cd721cfd41fd509104fcab6bb SHA-256: f5b9295ccb1daca33cc45054fa7861d360c0242acebe8e24216bd26068e795f8
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, many of which point to link farms designed to obscure the ultimate destination. One notable URL, http://topspeed4wd.com/ckfinder/userfiles/files/wafaxusu.pdf, appears to be part of this link farm. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the phishing and link farm nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://topspeed4wd.com/ckfinder/userfiles/files/wafaxusu.pdf In PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/8532249512.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/78970334247.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bufeki.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/86989188784.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/lekexexipovivizavasifun.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lanawovobezorududilaxav.pdfIn PDF document text
    • http://myredm.ru/uploads/file/nefavafobowowopodozexiw.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/vopijemova.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/jogaminisajap.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/samipekuweve.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/81813934365.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f90a00c17---xotiwak.pdfIn PDF document text
    • http://asid.rw/userfiles/file/70695806803.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/81567271436.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/82947749897.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/50822953574.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/80748818062.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/74502852756.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/welomalosawadatetawupi.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zesumulepijatovoselare.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/golabuxas.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/jijoviziveloxowarejo.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/dagovefumube.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/95994427223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=activate+ms+office+2019+pro+plus+without+product+keyPDF 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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 11684 bytes
SHA-256: 9eb073f1bd92e59edd6de9c6f428cceef86ed0fcdaad424e6a7bdb423450d14c
font_01_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 18584 bytes
SHA-256: b18c6846da995b54e7b713f910dc2409e08538cea4d72ca22b15be8587742825
font_02_sfnt_off00013bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1