Malicious PDF — malware analysis report

Static analysis result for SHA-256 425612a82cd47c5d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 19:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ee64f3aec1f06b3bee7f673e0db456a3 SHA-1: 75e6e3bf1ffb731a5be84bf8e4c0fc0fbe836cb2 SHA-256: 425612a82cd47c5d0b2e358182b50d42c9c550eab7af3955d5fe6b550fb3b750
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://benhgout.net/uploads/Files/file/nelederesuvo.pdf In PDF document text
    • http://luberoff.com/userfiles/file/kilatokifaz.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kebozisusapifazataw.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/begatemapefavasu.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210907000703_bcaay0.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_142201.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/34444548667.pdfIn PDF document text
    • http://itena.si/uporabnik/file/67976513452.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/doveposalasuxitivejozup.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/pajom.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f63acf59---wifakarokimadar.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/14226331181.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/ralisi.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/56335163299.pdfIn PDF document text
    • http://bulmarconsult.com/files/lepawod.pdfIn PDF document text
    • http://come2menorca.com/images/file/wodadugamelodumedosupoda.pdfIn PDF document text
    • https://hirurgija.me/files/nekafijilawila.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/baximexanepuse.pdfIn PDF document text
    • https://wita.lt/images/files/45301478072.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133492fbe472---56614608900.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/48705287733.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/diborifikenisezudole.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/wamubex.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090701300535.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/99291400243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=whack+your+teacher+superheroPDF 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_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 20208 bytes
SHA-256: da7487782e6559e20e94522da1d2f1fb51f0ff86b4996832e37067a216452ed3
font_02_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 10528 bytes
SHA-256: 410c527a1f838a50122a0ec0abddc0196d16188f134ed9e47c660743c4270338