Malicious PDF — malware analysis report

Static analysis result for SHA-256 58570ad851c67232…

MALICIOUS

PDF

88.7 KB Created: 2021-03-13 12:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6ef31da949570ac5e84f146da8a01b57 SHA-1: 136b3dd65f7d9fa4bb8c9b1826f110da511df907 SHA-256: 58570ad851c6723210153ac96e7fce9c7fffa067104926584dcc5aa83a8e16da
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=sacramento+state+bookstore+phone+number PDF link annotation
    • http://bluetea.space/vefevijozabusefelepqzq5s.pdfIn PDF document text
    • http://mishabelle.ru/xaxalezafezewirovegip2uv70.pdfIn PDF document text
    • http://smartcreditscore.info/26196428622tehgr.pdfIn PDF document text
    • http://tusuvopub.22web.org/actividades_del_curso_aprendizajes_clave_secundaria.pdfIn PDF document text
    • http://thehensleys.org/is_texting_ruining_your_writing_scholastic7qbt1.pdfIn PDF document text
    • http://immorta-cross1.club/jufan2vc9v.pdfIn PDF document text
    • http://khareedforosh.com/xofexibefifusiwubukosqk70z.pdfIn PDF document text
    • http://rozefuzapotor.iblogger.org/gagonunupogifuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_6023ea043cfbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453575/normal_5ff5696915438.pdfIn PDF document text
    • http://douchehq.xyz/6467094350423fu6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459470/normal_6001d660eba45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_6042c1bd0d3ff.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/balance_sheet_reconciliation_tools.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489853/normal_6000d4280c89f.pdfIn PDF document text
    • http://copyrightreports.com/samsung_rs261mdwp_water_not_workingiqezs.pdfIn PDF document text
    • http://wiregabjuk.fun/motorcycle_repair_shop_brooklyn_nyymt5l.pdfIn PDF document text
    • http://luminar4-download.xyz/panasonic_remote_eur7737z20_manual7sz7x.pdfIn PDF document text
    • http://mishgen.com/eitim_psikolojisi_kpss_km_sorular_2017002ih.pdfIn PDF document text
    • http://mon-cmso.best/polycom_hdx_8000_integrators_manualdqw82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/90420688239.pdfIn PDF document text
    • http://fonenutekosut.epizy.com/gupuwifawa.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/bose_companion_2_series_iii_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/all_watchmen_comics_in_order.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_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 5448 bytes
SHA-256: d37eb5f094b066598ff9068bb8216b810efb6df54b218b2966fc7f6aa5a151aa
font_01_sfnt_off00012d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D70 12124 bytes
SHA-256: e06b5776ec7333514c4f604d32cd040317b011f8e64f9372967e5e0f545ba0b3

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