Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f5e389fc1d1cc2…

MALICIOUS

PDF

70.3 KB Created: 2021-02-20 13:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 999276f8f793339c152f550f21b299d7 SHA-1: b26870c84617478a38f73e1ac12df73d0079a6ac SHA-256: 83f5e389fc1d1cc2ede8f32ce7d2e5ea581121b194145934330cc064eb89328e
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 0.9998

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://jottigo.ru/wix?keyword=the+fetal+skeleton+worksheet PDF link annotation
    • http://handler-autoscout24.com/zepum4dgb4.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/gRSCjiU/sonic_cd_classic_free_download.pdfIn PDF document text
    • http://file-id.ru/comparative_and_superlative_exercise4no46.pdfIn PDF document text
    • http://kunonelujaver.22web.org/11645703332.pdfIn PDF document text
    • http://geosen.net/adobe_flash_player_activex_msi67h8h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_6027db31c396f.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/ieAhaBq/zizafojewixoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_601d4f098d6d7.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/uzgdHgf/bapeko.pdfIn PDF document text
    • http://trokot-roznica.xyz/django_bootstrap_login_templateebawx.pdfIn PDF document text
    • http://mklhhhh.space/55905421705pakey.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/rFgShaL/fifth_edition_character_sheet_hacked_apk.pdfIn PDF document text
    • http://familyit.info/junivisokameazm3m.pdfIn PDF document text
    • http://rotixumuzu.22web.org/all_information_about_upsc_exam.pdfIn PDF document text
    • http://hrushch.space/99202749682i2b9o.pdfIn PDF document text
    • http://wadefefukob.iblogger.org/97940085467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javoxowixeb.rf.gd/zupeguduxunedudizebe.pdfIn PDF document text
    • http://bavidoripo.epizy.com/vagezikozupogise.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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 4960 bytes
SHA-256: 06c832f9bf60921f0bab243d24cf676eb9fbac08e91763fb7431d561a80c489a
font_01_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 10492 bytes
SHA-256: 6b05e1f8ee06f53ea2b0530b8e94b65c4c8dd9c56dc378019551b331d2875f09

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