Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf64c13cedd92014…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 07:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0c00d7f1231cf15f6c5a59bf5b5d409 SHA-1: 02e56eb71d2e6651341c47d98667bf72bf7abec9 SHA-256: bf64c13cedd920144c68a2dc63ff6bc9c29b4345cc13afaaaeb97d14bbdad701
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=htc+desire+s+factory+reset PDF link annotation
    • https://inprovit.com/ckfinder/userfiles/files/60483745872.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/weluwoxebemoduzowimabaruv.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/68069334993.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/pedemewurewavamoma.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/bolitori.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/86070151278.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/67707789922.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/17562269782.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/dofikilapiretevili.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/26303499803.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/gejejovujamirajitarag.pdfIn PDF document text
    • http://techbis.pl/files/file/69936000512.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7737eee2d---kugijipulivime.pdfIn PDF document text
    • http://askort.pl/Upload/file/zalosunesipeja.pdfIn PDF document text
    • https://rafautama.com/uploads/file/gamuxipokitolazidoso.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/sepirotibuwexuji.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/babonagajorodo.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/88356616057.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/zubizarixinikome.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/xamut.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/tolisagutojofuvoparatex.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/venokewuj.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903072137784964.pdfIn PDF document text
    • http://vit-physio.de/file/sujajinajafijib.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/patotiwojumitujakazulux.pdfIn PDF document text
    • http://lj-group.cn/upload/files/76870190394.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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10424 bytes
SHA-256: 548b059334dcd09c6f67b078d74347c4b098dfefcf533db7765c05e2760ac5f8
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 17796 bytes
SHA-256: e9a29e041667f7da1c85aee43dc97ac1947c266a926aec1d24bb2bd1ec085810
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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