Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a023a5ce354ec5…

MALICIOUS

PDF

83.6 KB Created: 2021-03-28 22:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 288ce4e3bf58d0104c681cc4a81aaea5 SHA-1: a0f2eec202e10e42ba7e789065e96a4a8f45384e SHA-256: 83a023a5ce354ec5397a35a82e276d73b8b55b1c853da85bc3805f622d13f818
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, including one pointing to 'xajibur.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to redirect users through multiple disposable domains.

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://xajibur.ru/award?keyword=boule+de+suif+livre+pdf PDF link annotation
    • http://pazazilomereli.22web.org/16600758904.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/okChh83/magazine_ad_mockup_template.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/5jbjahi/danmaku_unlimited_2_1._0._15_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/JjchiDP/download_game_cartoon_wars_2.pdfIn PDF document text
    • https://cdn.sqhk.co/dipimimimewi/gdjg1hi/kilejotajupinumajekejo.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/g8iex05/jenevesidevuwaxobuxuw.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/instrumentation_and_process_control_kirk.pdfIn PDF document text
    • https://cdn.sqhk.co/podiwilur/geotYgf/iphone_11_pro_max_flashlight_keeps_turning_on.pdfIn PDF document text
    • http://vifuwala.iblogger.org/wemidelimutixapevevaxel.pdfIn PDF document text
    • http://cyberlife.store/89584713343z3pnb.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jagjfgj/tabelidolijemuvogipifu.pdfIn PDF document text
    • http://yoga-fitness.space/chautauqua_lake_weather_report800e4.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/LjdX1Qv/11289010767.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/eIhigc7/70747741114.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/pobigupeviferor.pdfIn PDF document text
    • https://cdn.sqhk.co/xukonobos/WhcHSA4/vufunej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/apoderado_legal_y_representante_legal.pdfIn PDF document text
    • http://wipovevoliku.epizy.com/english_activities_for_kindergarten_worksheets.pdfIn PDF document text
    • http://tokozod.myartsonline.com/bible_catholic_edition.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_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 4932 bytes
SHA-256: 941b85a21d4c16d865cc8e8ddc732186d8b35ea184b10a8c9e40c5e790e36026
font_01_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 12136 bytes
SHA-256: 3c9dc94c6a895783528932646f2739fca83db5f5f7da5c4588892f573a994b6d

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