Malicious PDF — malware analysis report

Static analysis result for SHA-256 53773b71e85b5381…

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 22:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 388957f1e128c444654afe8994467d49 SHA-1: 22692cd36040dcf51a585b06ea656ede3c625b16 SHA-256: 53773b71e85b538140f7434b4fafec70886174726fbe17e71c85fc53724c83f1
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The primary malicious URL identified is 'https://xezojetit.ru/strik?utm_term=how+to+troubleshoot+fan+relays', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL redirection strongly suggest an attempt to lead the user to a malicious site, aligning with phishing tactics.

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://xezojetit.ru/strik?utm_term=how+to+troubleshoot+fan+relays PDF link annotation
    • https://cdn.sqhk.co/giripiponi/jjgeii6/53467227682.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/hhchhgi/top_ten_songs_right_now_2019.pdfIn PDF document text
    • http://sonoxusa.iblogger.org/jaxipefupa.pdfIn PDF document text
    • http://tizeretozu.22web.org/79331039416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_5fe62674040fd.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/digvhbP/vitamin_c_powder_benefits.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_600c70c9e749c.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/ajbdjal/coronapp_colombia_descargar_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/680315fe-2ee4-437e-8ed8-f26d095c2be8/69357645184.pdfIn PDF document text
    • http://garolelawugo.epizy.com/7485827773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2578df03-0d05-4f5f-b577-926308370a5c/what_is_the_work_of_medical_laboratory_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48797d7-b71c-486d-b15d-f369a9ec0aba/virejofibepugarasaje.pdfIn PDF document text
    • http://fapadetesiwix.rf.gd/tikejaxibagewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5204374-bc48-4b8c-ad4c-04dcc2b3498a/what_are_the_elements_of_realism_in_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6ecdae-bf2b-4564-a870-ce33faecb199/our_mathematical_universe_by_max_tegmark.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/chirutha_movie_naa_songs_ing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9abc09cb-a3a8-44ac-b981-490a09987665/where_to_get_pressure_washer_repair.pdfIn PDF document text
    • http://xekokopadupino.rf.gd/reformas_borbonicas_en_el_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc37ffc4-fd69-4ea3-b6c6-bd3d026feaa9/is_he_testing_me_by_ignoring_me.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 4984 bytes
SHA-256: fbb2ff66143b23d56b9c156c3995a69de5cefbccda81992cf78d52bffb643227
font_01_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10856 bytes
SHA-256: 4a615bbd0c381855a7770ae52df336a0ffe735e1fd452f3339293218e306ce67
font_02_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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