Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bc102ae39c3b90…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 03:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83f9dea9d05b4a41cd2350894fc5b568 SHA-1: 3c03a403d14d7c781c7b439dee8b88f3dbbdd739 SHA-256: 17bc102ae39c3b90701a1381d83a968fbda5c68722bd9c6e0e3d0284020d586d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://agape4u.org/userfiles/file/95028289883.pdf In PDF document text
    • http://freeorden.com/media/file/binod.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/2039309735.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/dujib.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/zoxemuxu.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/31481373282.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxowen.pdfIn PDF document text
    • https://zzwgjx.com/d/files/xomitopugonar.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/nulimerixilevupamebi.pdfIn PDF document text
    • http://selidbe-beograd.info/files/48817325817.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddaeb817b5---29703445891.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/miguf.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/kezoxaraporodusegajo.pdfIn PDF document text
    • http://didopack.com/files/nuvutilib.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/bujoluxeluk.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/wuwubetomum.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/kasix.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/80039789186.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/gululixizorunakusawinitot.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/satukiti.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/75463572210.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/26077978384.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/61221987424.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/29608745590.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/todogajozurekukul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hard+reset+mi+note+9PDF 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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 10524 bytes
SHA-256: 39c44b45499ce1a9802d21f5fcc98afe8145fc25207bc4446a960e5fa8b5b751
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 20928 bytes
SHA-256: a1bcf568055fa167d7b87c68013009a173b61170544643aefd5f03f5dda748af