Malicious PDF — malware analysis report

Static analysis result for SHA-256 073bc1c637a5b666…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 21:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aba25d1f5e3952215575e99356ffbb95 SHA-1: 04303edd8a6760697c4453c408cff19ef7dce541 SHA-256: 073bc1c637a5b666e18b2b07478138ba9ba392203d1eccb40b63cb67c2f5a030
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The presence of external URIs and a link farm on disposable hosting suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/123?utm_term=honeywell+car+air+purifier+manual PDF link annotation
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/ce18beec.pdfIn PDF document text
    • https://detajukizupen.weebly.com/uploads/1/3/4/7/134704356/jefawekosu_visub.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/4550939.pdfIn PDF document text
    • http://bufizuz.22web.org/vajamogu.pdfIn PDF document text
    • https://nonemofolovexuv.weebly.com/uploads/1/3/0/8/130874593/5540656.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/gomazoporuvive_bawebozes_wusut.pdfIn PDF document text
    • http://diziretojiz.iblogger.org/operation_iraqi_freedom_campaign_dates.pdfIn PDF document text
    • http://kaxunatinoti.iblogger.org/how_do_you_calculate_the_standard_enthalpy_change.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/dometasulipos.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/fozowelu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06aaf12-b244-40ed-91ed-05253f05ddd3/29071911350.pdfIn PDF document text
    • http://suwulinivez.rf.gd/conditional_probability_practice_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cc5496-d319-4769-8a95-0f83526df562/4th_grade_math_standards_sc.pdfIn PDF document text
    • http://miwafugupek.epizy.com/61341825777.pdfIn PDF document text
    • http://medojowibapij.epizy.com/tetar.pdfIn PDF document text
    • http://guwopide.rf.gd/78113348077.pdfIn PDF document text
    • http://rifovedukuj.epizy.com/tewekipetozifiki.pdfIn PDF document text
    • http://mimugoso.rf.gd/59626235668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28adf73-070c-40f0-91c2-14f90a4c20bb/coleman_dual_fuel_lantern_single_mantle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db2d031-09a0-432a-9e0d-650d68e9fb2c/42173266808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ed03f0-2229-4d7e-a4c4-e63ba8674aba/60096849771.pdfIn PDF document text
    • http://zugumez.rf.gd/tunulabupokobajil.pdfIn PDF document text
    • http://wawapudatubu.epizy.com/what_psat_score_is_national_merit_2022.pdfIn PDF document text
    • http://puwomuf.rf.gd/conjunction_practice_worksheets_with_answers.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_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 5136 bytes
SHA-256: 0afca7a48545d2193915e62956069910a2d7951e004bd49e494794a9b3cd6768
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 10580 bytes
SHA-256: df9f0390561400c3dd9314c58d8965fd4b38a1870dc6bd53e792ae877017353e

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