Malicious PDF — malware analysis report

Static analysis result for SHA-256 089a58ebe5529d0a…

MALICIOUS

PDF

74.8 KB Created: 2021-06-02 10:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 86b562319758649d07c2e79f9c2743b9 SHA-1: 9302efed90111cce2917e1e109e72215e1cca074 SHA-256: 089a58ebe5529d0a789135588545e283bbbcb5cf3b7918d56a5f15787cff83f1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://catamma.ru/pbw?utm_term=ejemplos+de+citas+textuales+cortas+para+ni%25C3%25B1os+de+primaria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389801/normal_604364de03dfe.pdfIn PDF document text
    • https://xedaloroxolujig.weebly.com/uploads/1/3/4/0/134018039/85eb9.pdfIn PDF document text
    • https://detatabuloto.weebly.com/uploads/1/3/5/3/135346227/zidad.pdfIn PDF document text
    • https://morisoxurekes.weebly.com/uploads/1/3/4/4/134464458/dakodidasi-tizivuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_60165075cd11d.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/69bda8b.pdfIn PDF document text
    • https://kinefowez.weebly.com/uploads/1/3/5/3/135329655/wamonupago.pdfIn PDF document text
    • https://nejonuresuf.weebly.com/uploads/1/3/4/8/134897458/widokituwunexe_ladefomewosasu_rikow_niraxidopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426269/normal_60017e57855b8.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/setisofivobek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494432/normal_5ff5bf1a86438.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sinorodolu.pbworks.com/w/file/fetch/144445011/202076894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53122c94-c9d8-4fff-a447-a274b951d2d2/ejercicios_factorizacin_de_polinomios_4_eso.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144425217/power_probe_3_fix.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/f/will_asus_zenfone_max_pro_m1_get_android_10_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2f38f7-7355-4cdd-b49f-1d6a674be4a0/xozefesurowoxalezoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f60817a-24c0-4f30-9333-a7cf6538c278/zovadesi.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 5532 bytes
SHA-256: b20c0283119344a02a67400f6c2e6d45c04521d2af7c88d7a119f1efc67248ee
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 11576 bytes
SHA-256: 22a9ded9387344c27a956516b8fd75bca3c257d900594cbb8c3fd5cd29d63933

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