Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f3436f1c53fe61…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 06:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b19c6c0f60387f2e2031e3b7332b5c5 SHA-1: ec65272f2927a763d31e7c97b23e6b96ba0279e6 SHA-256: a1f3436f1c53fe61991ede5af78c7b98b298533d6444fc115ac8ae1554e52246
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=android+1+nova+legacy+mod+apk PDF link annotation
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/81687266707.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/zaxasuviz.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/56387629558.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/xotexixozogibodubaxaluter.pdfIn PDF document text
    • http://bamila.vn/luutru/files/zivewekuzolosofe.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/50701555882.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/vaxepokobex.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/49368818655.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/zifavaxiv.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/zebunereresuzojob.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/xoronivem.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/bosetoruvozipivumu.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210911_135948.pdfIn PDF document text
    • http://unseretochter.com/images/file/zobalevovuzepuwopegufa.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/xuzawiguwabovuremedasub.pdfIn PDF document text
    • http://blccy.com/userfiles/files/totap.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/xoseraluvagutiw.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/misaviwe.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/nuzutopuzijoduzigubo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/fabelevi.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/62479163359.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/86151952431.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd088f661---56097499873.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/63544620984.pdfIn PDF document text
    • 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_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 17856 bytes
SHA-256: d2e1eb954946b24fe8199a018b72fcc975ed5e56acaca2102fc081de73a9d696
font_02_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 10896 bytes
SHA-256: 6f709dea860ecd47416e35e49290a9fdbe37900308f58bab66d12323b5270459

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