Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6eb9e6ca7ab9a5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 08:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e4d64b61c8f61618cdfd42693293b27 SHA-1: c3889fa91af1af7ab34d25819685f6fdf420a82e SHA-256: 4d6eb9e6ca7ab9a59f3c918d8cc7011480b1179140d9f63f100ffde6e8d7143c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious content or phishing sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bcslaw.hu/admin/fck_upload/file/gepawitorenawed.pdf In PDF document text
    • https://sportsslife.net/upload/ckfinder/files/61076761097.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/sijarav.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/dudip.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109020817558789.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/99027029752.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/tiwaniwejitiziwolanigemo.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/79192596321.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2affceea9---mijozinulorovikotav.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/78688339650.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/93509850902.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/zawawirilukukibidezepozu.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/riluk.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/19811644066.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/wexixowivetolevilebat.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/sifokanaveniwogewesegutoz.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/mopopuw.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/81943107702.pdfIn PDF document text
    • http://93564497.com/userfiles/41949771905.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/72699254872.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fca27a169---76986196742.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/54532367887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=snappy+streamz+appPDF 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_off0000c761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC761 10404 bytes
SHA-256: ffa07e10802e8819027c070c6feb59bb65401fe609060b8284d5d5265e2d29de
font_01_sfnt_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 18044 bytes
SHA-256: 7da97221e65a0344ae8ba90b90df7a8edd91e14703812c9eacb9dc7fa46d01de
font_02_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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