Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6025078ba0821ba…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 14:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7f23852a4f7718c7603b9c432e61de68 SHA-1: 9d9223819fd354c5e9d722fe73c356898ed20636 SHA-256: e6025078ba0821bac24d8fb174f319062ff1ee90da97b140a8947bf11d2e3ef6
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, contains a URL that is also present in the heuristics, suggesting a phishing or malware distribution lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=is+it+easy+to+learn+hieroglyphics In PDF document text
    • http://firstflirts.site/55715248868wfh94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368466/normal_5fec8ddbb878e.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/la_catedral_del_mar_season_2.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/2137236269.pdfIn PDF document text
    • http://optamorem.com/download_head_soccer_laliga_2020_mod_apkk1i3w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470821/normal_5ff9eb90bdd5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_6015bf745569c.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/preposition_activities_for_grade_5.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/the_complete_works_of_swami_vivekananda_volume_1.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/beats_by_dre_wireless_earbuds_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460057/normal_5fdffdd8379a8.pdfIn PDF document text
    • http://importants.space/finunazedakekukanavalunesg6d3x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_60388b00146e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexabimumemig.atwebpages.com/wezekujimaxo.pdfIn PDF document text
    • http://xevunikusixed.rf.gd/alternator_circuit_diagram.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/gidijudolosu.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_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 5232 bytes
SHA-256: d172b2c61b808af59b094a6555d1097a10f4ae2b68a62f7c2757e17834ec4024
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 10416 bytes
SHA-256: 875aa8ef3ab07a43e5dfb56d6e1d59024812bf106f5792edc59ea3d66321b923

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