Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eaf46451123f9d3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 02:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8d8b937306e24046866ecd5b509f6c5 SHA-1: 6ce9e1b4edb10f17e061f83659660f8093cfc3f6 SHA-256: 3eaf46451123f9d3bef05e1f970c9171bf33da7e22e03f938ed3097556eff76e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of a link farm with numerous disposable hosts and a deceptive download button lure suggests an attempt to trick users into downloading further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://bbu.vn/Images_upload/files/46096040400.pdf In PDF document text
    • https://aldapa.eus/files/galeria/files/26458526723.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/84224393461.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/47386626645.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/60906931150.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/88717187189.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/zefin.pdfIn PDF document text
    • https://bunianco.com/other_files/File/15963714464.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/koraxebowixo.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905173754090.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135322f83c60---60575693083.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/23485201.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/32042129949.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/seruladunaxode.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/potojuvepa.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/sirimevireduma.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/87365848231.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/palaviz.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/95490998175.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/venupividelazalaput.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210904202305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+game+nascar+rumble+ps1PDF 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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 17500 bytes
SHA-256: 42e836cca48fdcd5b891c28427bdbb5f83c7e1b6cdff3dc60605b0fe58a0c4ef
font_01_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 11044 bytes
SHA-256: ed360dc0616d0c680d447a6ab946c6cba51bc9ed64d9672ba3fa571fd0c26c89

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