Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f86e1849cb5d9f8…

MALICIOUS

PDF

75.6 KB Created: 2021-03-15 21:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 172a44c1fa8472e8db6332f8b727bd58 SHA-1: b6d9e1224b221f6d83af8c56eba1fd28c28e4d04 SHA-256: 2f86e1849cb5d9f8468d826a59962bebbb071b138cd6339870de984b94f36be9
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 0.9998

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://crophysi.ru/wix?keyword=prentice+hall+inc+economics+worksheet+answers PDF link annotation
    • http://metalllift.ru/85472135725a9rdl.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/can_a_durango_pull_a_camper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_5fd319b1a21c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_603d0af98d3f0.pdfIn PDF document text
    • http://mowuvivof.22web.org/49519650418.pdfIn PDF document text
    • http://dijawobal.iblogger.org/bruce_almighty_full_movie_360p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_601e20a2883e9.pdfIn PDF document text
    • http://whitetwo.space/3050970482zols1.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/50146688824.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/pamarukozuzubugekomona.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_8775b9c3877c4949a214dcdaf6b2e1d1.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_4f9a2a9dc3c04971a5bf7e0447499271.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_761dcd3a47d84e8da4c21135c51897fb.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_d92cb26910a34a62a1535a3f71a2f248.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_e7177a1e372b4358a4f973558f36717e.pdf?index=trueIn PDF document text
    • http://wesovipimamino.epizy.com/73957529534.pdfIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_282f2070d5274558adab6b89b57f048b.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 4984 bytes
SHA-256: 045584be997b993ccf37ebbcb0c23fb3d7c632d4ba19502ca1712c0ebaab7b4e
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 11120 bytes
SHA-256: dd64025a9ece722c00daff916b9fb84ec14a53e38a8f69efbec0650738defcbb
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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