Malicious PDF — malware analysis report

Static analysis result for SHA-256 29aabb141c31ac1a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-21 04:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a746d148148633dfb7f62401f3565b0 SHA-1: 1344c5c5baac94196c0421ad0c46048dc17605bf SHA-256: 29aabb141c31ac1a50a8a8c237c4827e8b59e846cbdb9af52776c23fb3165c97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable or unknown domains, characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://icoachyou.biz/images/ckeditor/files/31749949501.pdf In PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/xodalonozuno.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/xevofutiworalivizunut.pdfIn PDF document text
    • http://miminku4.com/contents/files/nibawefaliwijak.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/43426353154.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/34497166408.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b824a8e2ee---59000697019.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/fowalifegilogif.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614341cb4a4c1---tumuporopurukozepim.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/bipijutudad.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/61581559913.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/zodopinapufeximolutodi.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/sivasigukomesoz.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/46844616460.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/vumemeki.pdfIn PDF document text
    • https://lordoptika.hu/files/files/pufiwad.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/72854167015.pdfIn PDF document text
    • https://maisonforville.be/documents/file/wifawos.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/wonunotugatuxajat.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/40055129161.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/86926966695.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/mujagosiw.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/63b6f53d36359a93502898c7966835ec.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=metal+gear+solid+5PDF 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_off0000b189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB189 10448 bytes
SHA-256: 35e097d2dbd563335e09f6dcbf71f923817b52c8423d0d6bc0b4c8fe5e54516a
font_01_sfnt_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 16536 bytes
SHA-256: 26afb32117707402bb15ee777c206b6dbf6bef5b2652bfe29a6806167fca6130
font_02_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1