Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e9afa2596f489f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 04:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5adba6de1f4d0e04903cd8c4949027ac SHA-1: 767fe3879e90f2a569a88927cf2a7b66e935869b SHA-256: 15e9afa2596f489fe2733cd8e962495050aeafb7ad4070bd3d4e31fe974351dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier as malicious and contains heuristics indicating it is a link farm designed to host multiple PDF files. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's intent is to phish for sensitive recovery secrets or private keys. While no scripts were explicitly extracted, the presence of numerous unknown URLs points to a potential download or redirection mechanism, likely intended to deliver a secondary payload or lead the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://pmapmc.com/userfiles/image/files/15142888039.pdf In PDF document text
    • https://lhorizon.ca/uploadHorizon/file/domisagomijolobonibob.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/12465525109.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/majimu.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/xolijexivu.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/lurorunovalo.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/54686480284.pdfIn PDF document text
    • https://signika.pl/Upload/file/30673794627.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/37474183069.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/57618910367.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2da6d4600e86ddd9634abb322c963c63/24233014451.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/59461951402.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/7738958164.pdfIn PDF document text
    • https://rosycaffe.com/file/10151036471.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/41050780720.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/gasivikeden.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/gidufemolatisulenesu.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/bidogorumuw.pdfIn PDF document text
    • https://spacio.hk/attachment/file/45739571003.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/jararejajor.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/87541872180.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/lakaduvenobodovojipubog.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/94561095822.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/xevoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+add+library+in+android+studioPDF 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_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 10540 bytes
SHA-256: e7f10318518e7bfb747000ee43ed1e80d47828b95f9f7f081ad689cddb1d9a3b
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 19080 bytes
SHA-256: bf3581cd41b01c9133e034726f1ac5bff6eb2b8fac02c91d3de84e89f4ff10bb

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