Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7039add04fb34f…

MALICIOUS

PDF

78.4 KB Created: 2021-02-12 18:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e0dbb39e7ebd0878829f8ddca39db565 SHA-1: c6fb4d314be0c42b47f931fb1925f090da8e093b SHA-256: ea7039add04fb34fe4aa9b6e514802de70d14a9deac8ca10920b32d02cf41114
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 hosting or link farms, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

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://seumenha.ru/wix?keyword=chicago+fire+season+2+episode+9+cast PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5ff2250ac03eb.pdfIn PDF document text
    • http://crysety.xyz/kupabuwoijw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_601a1f38f2cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_5fe79088b33a3.pdfIn PDF document text
    • https://cdn.sqhk.co/samojusive/8iaelib/75753602133.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/ZidNdXt/dubifuxibosafufagawuvas.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/y5Tniib/narcos_idle_cartel_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407100/normal_60049106ccf9a.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/dNjjphb/teaching_strategies_gold_member_sign_in_my_account.pdfIn PDF document text
    • http://qwonder.space/aqueous_humour_formed2yds2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_601de11d0dedf.pdfIn PDF document text
    • http://jazabezul.iblogger.org/total_coliform_count_standards.pdfIn PDF document text
    • http://javebamugizal.66ghz.com/ajmera_new_video_song.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/tiduro/orquidea_negra_neil_gaiman.pdfIn PDF document text
    • http://sibisewol.rf.gd/c_string_format_concat_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/mavole.pdfIn PDF document text
    • http://samanoniminowut.epizy.com/tijemu.pdfIn PDF document text
    • http://repuvamiperubo.epizy.com/gimopofetadoned.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/agricultural_revolution_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/52739916500.pdfIn PDF document text
    • http://luzigipo.epizy.com/sqlite_browser_free.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_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 5580 bytes
SHA-256: 826711775c8dbc5579a1beee6e0466c37a662c5ee9165863b8f89985993a6cee
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 10220 bytes
SHA-256: 49a832d89ab2462775690334e1ec6c034b52358b8932b1dc301279399b49b992

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