Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e18bc4966df9fd…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 00:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: aea15cfc2254386a90637b0efe43ccea SHA-1: 896b562845d1c53a73b674aa33f403f589e1faf6 SHA-256: 15e18bc4966df9fd7c4ce4b779a7b064a62fb3fb2581f685152c23030cfefa00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to external sites, and one heuristic identifies it as a link farm on disposable hosting. While no scripts were extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://okna-kursk.ru/page_edit/_samples/userfiles/files/lupotebitesevatedesapanam.pdf In PDF document text
    • https://maryamghiasi.com/images/upload/files/kasenewelafa.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/39801347250.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/lapebis.pdfIn PDF document text
    • http://anm-av.de/uploads/files/lofanatubisexefo.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/26845355794.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/40768874534.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/boxokuzevoxekumavudipizev.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/vurumikubejo.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/91970304025.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/56902571858.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/1002778229.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/jogaxenogemun.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/102546193761326cc9b0e46.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/zusulitevivurubakivoxon.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/kawuloxukeladaxijiwoza.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/dixutosokamet.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/87030124311.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/20861369195.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/42997221677.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/jetiwipinunepitulelamep.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/wupasifulitulalamawufo.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/fupibomowejejizimu.pdfIn PDF document text
    • https://bor-diing.com/upload/files/xakarepujokifu.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/lufikupanifuwuwapewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=seo+keyword+research+toolPDF 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_off0000c51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 18652 bytes
SHA-256: 4da2c8135a2a561a53c86cd964e097da0213e66c5dd8d4d55f4177c2c34d5dbf
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 10640 bytes
SHA-256: a0655e41fbc98a045c2974feea348c3fabea994b20af4b35db6bc3d0dedd0e5e

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