Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd211f1e4c995fb…

MALICIOUS

PDF

92.0 KB Created: 2021-04-18 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5f687236cba94f0f9f12748777d8c077 SHA-1: 50d0a2c883b39d2665fa369a246b0683fc7ebf7d SHA-256: dfd211f1e4c995fb28f0c26a2c3667e521f663704ae669dee406c72cd65b0834
186 Risk Score

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 0.9995

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=a+number+decreased+by+8+gives+42+the+number+is PDF link annotation
    • https://didukomam.weebly.com/uploads/1/3/1/8/131857465/rarutonazu_wufatedasiduk.pdfIn PDF document text
    • https://zexamedoguko.weebly.com/uploads/1/3/1/4/131454027/3180f2fd.pdfIn PDF document text
    • http://dixunawizodel.iblogger.org/fifty_shades_freed_music_lyrics.pdfIn PDF document text
    • http://motivawka.online/88028511290gu35k.pdfIn PDF document text
    • http://yarrebitteh.online/best_penny_stocks_under_one_dollarpd34a.pdfIn PDF document text
    • http://svoylend.xyz/ficha_tecnica_raven2lm6k.pdfIn PDF document text
    • http://1s.london/vuwofu8taf4.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/administracion_de_medicamentos_via_subcutanea_tecnicar2kbj.pdfIn PDF document text
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/sogunutejutavi.pdfIn PDF document text
    • http://wide-take.top/33192732849a7upk.pdfIn PDF document text
    • http://ubzvp.com/descargar_after_2_espaolgl6dg.pdfIn PDF document text
    • https://sojugadetoju.weebly.com/uploads/1/3/4/6/134683069/juzelojofu.pdfIn PDF document text
    • http://idealica-uficiale.website/63516364061o8zu.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/xutiku_varefis_zazadu_marupapufexiju.pdfIn PDF document text
    • http://hookup754.fun/keeping_the_republic_6th_brief_editionfywt4.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
    • http://viwuleraxukopiz.epizy.com/carbenes_and_nitrenes.pdfIn PDF document text
    • http://nefaped.epizy.com/the_snow_child_angela_carter.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_f4c9b68f73714ee1866d291b5f43386c.pdf?index=trueIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_d6e7a81bf02343a2a55fea16c8592e27.pdf?index=trueIn PDF document text
    • http://fonumorawupako.epizy.com/aerobed_comfort_lock_queen_air_mattress_manual.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_1f43ef1a7130455690b5c86d9e009d41.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_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 5800 bytes
SHA-256: 2b0df804e6051b97afd26aabbf9f8d9b0e32775e610419a16631bb05ccd4b204
font_01_sfnt_off00012d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 11340 bytes
SHA-256: c35d83375960f48bca3c92ce342de181e2f325a6c4d56ca286bc88663dbf01f3
font_02_sfnt_off000153f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176