Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d5bc77c782b8fd…

MALICIOUS

PDF

99.3 KB Created: 2021-09-17 07:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e246a52b64fde1c5913f2a905954dedb SHA-1: ba801baf585b4c1562d73210e3fb03ecbca035ef SHA-256: 06d5bc77c782b8fd23c08555039d939db70a161ef7de1fa38cdcc00f6d3eb444
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous distinct hosts and a high number of links per host. The embedded URLs, such as http://milwaukee.center/userfiles/file/vumalejuge.pdf, likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://milwaukee.center/userfiles/file/vumalejuge.pdf In PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/fikazab.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/tiropixilufove.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/veboxuwekarigubefo.pdfIn PDF document text
    • https://vendax.ro/files/file/81334908954.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/57995670491.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/52088040271.pdfIn PDF document text
    • http://reichspfarrer.sk/file/17494325694.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/muwanifuwub.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/rasumazadenifanimiga.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/zewejavimedenusivak.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/pulotazuduverem.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315201e6a0b---dojabibi.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/daluzikokuboxazedosano.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161363c6249402---pulet.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/32478134323.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/bemomemezotirevijosex.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/zusuxagekosomefisav.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/68989568289.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/tenerevarorexurasevupobug.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/bubaninafudodafaxopiborag.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/melakamawaxigofabiwo.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0056919001631235355.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/pawusatafumerelimisurufog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+gravity+between+us+ebook+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_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 20256 bytes
SHA-256: 893b2aa29f578feb260040e15a0bf5cac22e23b42fd55895743dca963fb92ac3
font_01_sfnt_off00014d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16533 11196 bytes
SHA-256: 5cfbfb1ebbb6d6b6823bc12549b925a4a0ad5342b8f529d0f4866f50a8f26aa6

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