Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3f64b5ea1a0ee2…

MALICIOUS

PDF

79.8 KB Created: 2021-03-29 19:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d814eae667939d6b3f576f59a007df8 SHA-1: c68a7ee8f5e6bb1bf2bc6a70cd7bc35f9ffde013 SHA-256: 0a3f64b5ea1a0ee23e26a03c4ef830d3543f162fcec6880085724188d374140b
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 0.9996

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=rise+of+berk+hack+apk+2020 PDF link annotation
    • http://mstmail.space/245540257445qzb9.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/ggghjzr/75992106302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467032/normal_603aa4e8bff99.pdfIn PDF document text
    • http://distornyup.site/how_to_change_battery_in_accu_chek_performaw5lsc.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/chekMJt/josoxufifarerimejikilir.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/1081594841.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/jeNhbgf/bewes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_60568eeb27b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_60405b1a9d747.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/76715474626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415530/normal_5fce4e21ba674.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/sosipu.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/aZ4rAtc/di_moda_pizzaria_freguesia.pdfIn PDF document text
    • http://everydays.space/deductive_reasoning_geometry_worksheet_with_answersak6y0.pdfIn PDF document text
    • http://zoosalon.org/dan_brown_inferno9i5u7.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/2021_lexus_is_350_f_sport_awd_pricedzzra.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/zetituri/data_analyst_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/624182768.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/rutepavobabozizob.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/pioneer_dxt-2369ub_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/rabejozaborogema.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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 5556 bytes
SHA-256: d1af2923222b7c05f45dab94e0572840c34e438151cc7d7137604756eb8fe04c
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 11016 bytes
SHA-256: 76a0b0d5167ed6985ba60c82c402b5fb8dda6b594f3219ac9f062a4f52b4de15

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