Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1c360d004d63ee…

MALICIOUS

PDF

75.9 KB Created: 2021-03-10 11:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d6e0470464c5ecdde3280b482e397a01 SHA-1: b038bad1c02e140d8760f50983c972b8e715c364 SHA-256: 8f1c360d004d63ee7bc3e5e375b3a6b8d227f7a034c6ca586a2e513da82c7d73
126 Risk Score

Malware Insights

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

The PDF document uses a lure related to 'psychometric aptitude test questions and answers' to entice users. It contains numerous external URIs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=psychometric+aptitude+test+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444644/normal_601f23549bf26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408720/normal_600869a399802.pdfIn PDF document text
    • http://tevfikyuce.xyz/attention_charlie_puth_mp3_song_download_mr_jatt20l5a.pdfIn PDF document text
    • https://govexofube.weebly.com/uploads/1/3/1/8/131872198/jutanosifixufakep.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/9589531.pdfIn PDF document text
    • https://xufujume.weebly.com/uploads/1/3/4/8/134851049/ropowomumodikaxaga.pdfIn PDF document text
    • http://newigatop.22web.org/24244095289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6023c62063dc2.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/la_historia_del_caballo_de_troya_resumen.pdfIn PDF document text
    • http://tujidal.mypressonline.com/reloading_pressure_signs.pdfIn PDF document text
    • http://claire-irk.ru/which_of_the_following_statements_concerning_internal_control_is_truej8pei.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/jolasujujuga-finamosovu.pdfIn PDF document text
    • http://discount50.pro/cisco_dpc3010_docsis_3.0_cable_modem_default_login65ywf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505771/normal_600274938358c.pdfIn PDF document text
    • http://cyberlife.store/what_is_linear_and_nonlinear_editing14msq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468819/normal_60197978153b2.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/5429656264.pdfIn PDF document text
    • http://cashthe.ru/dunepevonegupijokedog8ms59.pdfIn PDF document text
    • http://lapivezog.22web.org/88196954628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 5684 bytes
SHA-256: b820a6b91c30c76fac4cb264320da18eae31f772f7a86b81cbda40ecbda79c3e
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 10832 bytes
SHA-256: f978ac8aa2ccdd7aff350c7658bfe06d9ad4958557a41889e1d61a8a209a065f

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