Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecefe6829d610a81…

MALICIOUS

PDF

74.0 KB Created: 2021-04-28 14:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f9e6cd4dfcccddb469b20f39234cf0bb SHA-1: 917adcff3588f707e4fb469367b99780ca9c8350 SHA-256: ecefe6829d610a81904313dcb6cc999194b58ec37ecacc5995ce7e834640e0fe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=is+there+a+free+version+of+autocad PDF link annotation
    • http://zawugudumi.getenjoyment.net/4489408877.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/95107888032.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/1243548200933zb8.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/77538808969.pdfIn PDF document text
    • http://getveran.site/the_natural_rate_of_unemployment_equal_to_zero1qkff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5ff38c5836c48.pdfIn PDF document text
    • http://theharaka.online/do_all_lexus_is300_have_2jzly59x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384301/normal_5fe2b46c7288b.pdfIn PDF document text
    • http://opticsystem.website/worigafoniverumuvaxefurahszoc.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/Uij6Cgg/sedefefof.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/Wohbzje/90728802074.pdfIn PDF document text
    • http://trikotoria.ru/nolirarhvxgy.pdfIn PDF document text
    • http://vezdesami.ru/pink_platform_sneakers_nikejje5j.pdfIn PDF document text
    • http://wirelessinfo.ru/jefegamodepewozasiron4mv32.pdfIn PDF document text
    • http://subejewumo.scienceontheweb.net/arbeitsvertrag_muster.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_601aee48c22bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_603a93f7b73b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxatigapisi.epizy.com/13901894951.pdfIn PDF document text
    • http://punozow.epizy.com/boot_jack_plans.pdfIn PDF document text
    • http://pebulibupa.rf.gd/dizemutipileberojevepe.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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 5076 bytes
SHA-256: 0a8c786b6c6b842bb5d064def330b17ff0af9305cbbbb2a0bbba01f871e59cbb
font_01_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 11044 bytes
SHA-256: 5d677aae4a61a9b40a29a52055c7cb596a4a4befeba88ce4e359d2e56cc31921

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