Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8bbc5db2c7724d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 01:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 345852368ba49e48e6c1e184ebd4dd21 SHA-1: 483355eac463618f4ab6f7b4e8a9dca782841286 SHA-256: 6f8bbc5db2c7724d5464fa75dde00a9bd08872f21a7c1234934dd38e9a6f1ab4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate this redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mobilenmr.com/files/files/9437560033.pdf In PDF document text
    • https://tezerwatch.com/file/upload/files/09-01-21-51-56-54.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vadubenovaterumafek.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/kovatelijaf.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/98784953796.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/gifadirevorasojo.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/78055090192.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/zojekewepa.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/66731207223.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/sazudirufutupizagijo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161340005a63b3---sivogudiritiwonasefopixa.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/jawuvolop.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/pifijonipo.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/37940449318.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/wugoxirakapuromerejelagox.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/ludegimodejikedufamepewi.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/28963952879.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/vezeporoginatifeg.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/19629462131.pdfIn PDF document text
    • http://darec.sk/files/files/42720191128.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/kilaximaxutapubasonaj.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/xizamexoxaj.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/nokogupinidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=games+like+vice+city+for+androidPDF 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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 16556 bytes
SHA-256: 22b444c7bed9794d2e81bfccee3364b6c68114d13bf18546c446dc6272bcba50
font_01_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 10948 bytes
SHA-256: 83ade7c35f67948217695f5007c8e2f51885637b0ec51fc7643157ab6125c4a3

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