Malicious PDF — malware analysis report

Static analysis result for SHA-256 75669f4d67b63422…

MALICIOUS

PDF

68.5 KB Created: 2021-03-03 13:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 98c12a21a1e1fad9e929c170b3e26c8c SHA-1: 9cac23c1eb6647c3e41f56509f15e60d1efe5b8b SHA-256: 75669f4d67b634227ece97541bebb965f0d71d09fe658a30ee62060bd91a71f0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'https://seumenha.ru/wix?keyword=the+american+republic+since+1877+answers'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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
  • 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=the+american+republic+since+1877+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468294/normal_60352531d8ac3.pdfIn PDF document text
    • http://kafixerutatad.iblogger.org/10891125237.pdfIn PDF document text
    • http://domavera.ru/83307210499oyvf8.pdfIn PDF document text
    • http://valaporinepisu.22web.org/briggs_and_stratton_500e_series_140cc_carburetor_cleaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421615/normal_5ff192ed8e1e1.pdfIn PDF document text
    • http://clubstore.info/how_to_install_a_rheem_electric_water_heaterkevm9.pdfIn PDF document text
    • http://rutopadazemed.22web.org/gisupejavimebaxelegaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://komivarutu.epizy.com/borderlands_3_legendaries_list_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/fozurijanidikowar.pdfIn PDF document text
    • http://vuloroluget.rf.gd/cuanto_es_un_metro_sesenta_en_pulgadas.pdfIn PDF document text
    • http://dudibagigop.rf.gd/how_to_stretch_a_karate_belt_wikihow.pdfIn PDF document text
    • http://bumufir.rf.gd/wavaxagazenefinuxetumalit.pdfIn PDF document text
    • http://solobasoridevel.epizy.com/what_are_the_responsibilities_of_front_office_manager.pdfIn PDF document text
    • http://faripemisale.rf.gd/xoxakuguxar.pdfIn PDF document text
    • http://vonikolodu.rf.gd/free_powerpoint_award_template.pdfIn PDF document text
    • http://vezubigaru.rf.gd/dubaxanikaforo.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_off0000cec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC6 5680 bytes
SHA-256: ec062f46c27cf5c477d63e31752d624355dd6369b79f98fe0a830f3772f1473b
font_01_sfnt_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 10300 bytes
SHA-256: a9060fa34624405d61619ee40b53d3cea5076689324ca0e22806aa97b4388800

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