Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13706143a0d22c6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 19:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e0fc183e9ecf587dd8c86c3d90cdad2 SHA-1: c6aed81ec5a637c94e0b85af6ddfb23eb9e489c9 SHA-256: a13706143a0d22c620d660fe64f57dc0884209bfd9f74dab2af7d4c2bdf0139e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing lure designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://drlalashow.com/php/billboard/uploads/file/60387962103.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/faac55cebb3492226ca6aa9d6a3c9021/64964414539.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/wazinufimovegulanivipe.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/puxaxasidesukos.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/49850713574.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/muxotobum.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/lapifaxuvubanatupit.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/kapetifigudaxifuka.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/87018566738.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/1378168013.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/66931030130.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/89428511095.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/36106190996.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/gerevikedekalewad.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/wupodoz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/94340795557.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/lowisupisejara.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/80720587408.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2823f572---27297261331.pdfIn PDF document text
    • https://aksusu.com/upload/files/rupuzexalake.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/57160818932.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/tuvepalukebulugagik.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/27244396572.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fowev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+lake+house+full+movie+freePDF 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://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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 17360 bytes
SHA-256: 6868510e4e392bc4ded81f5b339ae857df9dd97e84e0ecc01b0f14638ea4c577
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 10500 bytes
SHA-256: b14b582712038acd9442a9bb4362e9367d71bfbb7e7eb6e15989d4d05bc5b8d8
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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