Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad3fbbe1e7dedd1…

MALICIOUS

PDF

73.4 KB Created: 2021-03-11 16:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 42f89c21fc29cc97bcac055041fe0be1 SHA-1: ee8c18e8d32f803a2a70dd6827b0cc5be0a16160 SHA-256: 8ad3fbbe1e7dedd1a931e401d982d94d07714e3a0c1d80a1795b369280da1587
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet'. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

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://xezojetit.ru/award?keyword=greater+than+less+than+equal+to+worksheet+pdf PDF link annotation
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/lovoxisixarolavuni.pdfIn PDF document text
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/6839054.pdfIn PDF document text
    • http://theraisins.pro/sustainable_development_goals_indicatorsjgzoz.pdfIn PDF document text
    • http://ledivezakaw.iblogger.org/mercury_9.9_hp_4_stroke_oil_change.pdfIn PDF document text
    • http://dadevizevarek.scienceontheweb.net/78393931964.pdfIn PDF document text
    • http://dejenenipanoz.22web.org/maputo_weather_report.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/52195003912.pdfIn PDF document text
    • http://reabook.online/diono_radian_rxt_forward_facing_latch8bfup.pdfIn PDF document text
    • http://4escam-bot.online/china_visa_application_malaysia_formycper.pdfIn PDF document text
    • https://zetolame.weebly.com/uploads/1/3/0/7/130775520/6497164.pdfIn PDF document text
    • http://motivawka.online/294888895030yh8s.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/xirixepo/44145755439.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/daniel_kahneman_thinking_fast_and_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/fopuguxokifako.pdfIn PDF document text
    • http://vimobuzu.epizy.com/b350_bazooka_manual.pdfIn PDF document text
    • http://vozotol.rf.gd/18934993433.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/electrical_engineering_jobs_in_lagos_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/certificate_of_origin_form_d_indonesia.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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 5440 bytes
SHA-256: bb1518ad3eb38f2e43db6b3f1ebf2b074272e367da2166e2de608378b038889c
font_01_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 10024 bytes
SHA-256: 743c46e42e7c1058e1f364ec67b56a92f57c7f5a83131524b2cc361e3c53df72

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