Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f175ef0c80b8af…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 00:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af68125837f15093a97deda57283798f SHA-1: aeb44610c1655837f0a20387d7eec18e24dd0cdb SHA-256: 19f175ef0c80b8af35a2cd2806f0e73fbdbb301dbe63eb71318abad34515a635
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external sites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to phish for credentials or deliver further malware. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content, possibly via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://madeirashopping.com/userfiles/file/rekododader.pdf In PDF document text
    • http://lev-steklo.ru/userfiles/file/guguxene.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/79379042502.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/mutafe.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/motibuxalivonejemetusalid.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/rabekipil.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/gadunajiganeto.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/90374285871.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/guzumiraweregiwujoba.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/2410673863.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/mikojajomuso.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144690b2e5c4---72310217287.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/jugeset.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/28553695459.pdfIn PDF document text
    • http://c-amc.com/upload/files/45870248982.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/polig.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/vovazatotoxoduwifagu.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/33230538747.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/41396616511.pdfIn PDF document text
    • http://www.pvvc.cz/files/tebavubo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143005c47880---godepaw.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/2672295252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=taxi+sim+2016+free+downloadPDF 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_off0000ccca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCA 17960 bytes
SHA-256: 1258a8e0b3c296eb7ebe3ff4da2c6a7388648534b595ba0d7df570636d338ef7
font_01_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 11032 bytes
SHA-256: 2aab31aac286afe3f147f9c5a807929b83a2516303321eb4dfecda9e0aa99e50

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