Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c45381c24599ea…

MALICIOUS

PDF

85.2 KB Created: 2021-10-12 15:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34919a9996bcd00c39a44384d021f04e SHA-1: 6399c9bbf1a3d73489af633322783745dc19ea54 SHA-256: f5c45381c24599ea961b4c4129a028509d11fb576fe50bed3babd9770cbf2f91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. ClamAV and ML classifiers also flagged it as malicious, specifically as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://familie-schiecke.de/images/file/demoloretizazokedalisarax.pdf In PDF document text
    • https://rubfila.in/files/file/gemuvavilazemebitojisadaz.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/noruzis.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/rozogu.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/33430753466.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/79479478435.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202110080130513398.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jmu69h5l5adgj1iamljs8or95d/sopekikudazifugixowire.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/11790647987.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/82065870984.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pobuwuwumojera.pdfIn PDF document text
    • http://packamate.com/userfiles/37235413674.pdfIn PDF document text
    • http://com123.vn/uploads/file/vurunosurikijebudabiri.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/polexizuneb.pdfIn PDF document text
    • http://fitviewer.biz/files/file/penoparakudiw.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/nulelavagameja.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/37343936202.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/nulakiwafadopox.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/suregonifoputoziwozo.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/77801384464.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/91847384085.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/finagewilifoganaxa.pdfIn PDF document text
    • http://agaugservice.ukrkarta.ua/fckeditor/userfiles/file/meterixofefofipux.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/nokimufuwolosogafapelap.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/38891547812.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20211006083840.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=roughness+of+the+surfacePDF 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_off0000e381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 19748 bytes
SHA-256: bd867bca9688aefc49adc42d4d62c3986d5fc8b2bd8997a05563ab672486e66d
font_02_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 10620 bytes
SHA-256: 000f11a1c8cb4873393cb4ed4e6cd522703d1f1c864ef196b8e43ee311696202

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