Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2db4ddcd398462…

MALICIOUS

PDF

76.6 KB Created: 2021-09-23 06:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 622921de9fe0d1dd193d9a100a2558e1 SHA-1: 8d02987fc5b4e1df88a33390591ea291b3c64f2d SHA-256: af2db4ddcd3984624f6756e8a85bd994a0646cbfe00a9a774a94cce40632f9c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL distribution suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://desushibar.com/userfiles/file/kowodakax.pdf In PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/dac6d3837146485ba0e4f91cf8bd63f0/dokufipepapok.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/94146375641.pdfIn PDF document text
    • http://roocenter.ru/upload/file/71736806604.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/10628552482.pdfIn PDF document text
    • http://vo23.ru/upload/file/76310735524.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/nadasutejixusud.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/tiremazeje.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/27582456501.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/81414161704.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/98550512105.pdfIn PDF document text
    • http://kite-surf.sk/files/12231532839.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/gagikulepi.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/53597323633.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/62478565976.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907170019.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/ropewapomajedisugosuko.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614285752d32b---40211329053.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/46537736523.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/33750770002.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/dalufazigatiloxuboponi.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/semirorezaja.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/jevozapinigusefamez.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210913131914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+app+emulator+for+windows+phonePDF 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_off0000c5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 10928 bytes
SHA-256: 03543e39768f666061afcaaf63cbaace6c84893bf81c43da798c5a953b63cafe
font_01_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 17644 bytes
SHA-256: fc15cd2dc4de72aec065d9e7226ff4dc0392d09ba803fc981137f3c25c65c9d7

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