Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c61d5a3e7c95d3…

MALICIOUS

PDF

67.4 KB Created: 2021-09-25 22:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8305e50c3905702415d2fec56163ed2 SHA-1: f1dd07d60bca53ecbb27ac2f6c508560d3a21149 SHA-256: b2c61d5a3e7c95d3f7f824d7854ac75482420c82d49d5e4060a993a3c57bd67a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF format and the nature of the heuristics suggest potential exploitation of PDF vulnerabilities or embedded JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161465e940750e---27715448611.pdf In PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/fudewubujo.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/dujaguzidegosafinepis.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/sexumuzes.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/pazamiv.pdfIn PDF document text
    • http://learningkey.org/userfiles/zojuropabelezejozib.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/rataxizumu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b573760aa5---jaboxiveguremadibiw.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/31778626600.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/36163215093.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/25642294798.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/jaganelise.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210917035827.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/38095212324.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/ruwisom.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/morogosenifonedax.pdfIn PDF document text
    • http://wwstationery.com/files/file/4639575411.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/nemiporabonuw.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/susemeluro.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/81165733897.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210915_BD142EE84AB73CE8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=temple+run+online+free+gamePDF 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_off0000abaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABAA 10496 bytes
SHA-256: 7dbecd0f30634a47e9e0f393aabbefdd775758aff8047a8706c9e291a2923946
font_01_sfnt_off0000c36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 14688 bytes
SHA-256: d84c4066f3ff7c010e567d2df67604c0007a513677627570bc5817129cbfe350

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