Malicious PDF — malware analysis report

Static analysis result for SHA-256 9262cd09f2be03c7…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 05:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cc2c3083f6b935b1c56d8ba8b79b0bf SHA-1: 0f2c3c3593adfb5fdaa0bda5510d58dfccec5617 SHA-256: 9262cd09f2be03c75f1b38c0867f2bb6dfbd31cb5522d01b8a45bf91f9cfca02
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a link farm designed to distribute other PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic for a 'download button' lure suggest a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wix?keyword=identifying+polynomials+worksheet+pdf
    • http://vitetiw.getenjoyment.net/aerodynamics_jd_anderson.pdf
    • http://nemagufi.mywebcommunity.org/booklet_samples.pdf
    • http://dufigep.scienceontheweb.net/limemawapofugumit.pdf
    • http://ralugugifoxatir.scienceontheweb.net/39687501935.pdf
    • http://majofakidujuna.22web.org/baxadigaj.pdf
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/bojowugo-binokukimanujin-murewefepezenar-bozodoke.pdf
    • https://zuzuvisaze.weebly.com/uploads/1/3/0/7/130738998/gukivowuja-redawogepizu-mipodo.pdf
    • http://riwotivadejud.sportsontheweb.net/marshall_valvestate_2000_avt_150_half_stack.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rikopob.epizy.com/bosile.pdf
    • https://s3.amazonaws.com/lovetijif/consumer_reports_phone_plans.pdf
    • https://s3.amazonaws.com/vuliwisuwig/lugotim.pdf
    • http://gujusul.epizy.com/journey_to_the_west_3_full_movie_in_hindi_download_filmyzilla.pdf
    • http://godikopikigelug.epizy.com/36206075572.pdf
    • https://s3.amazonaws.com/gomaxod/model_3_range_loss_in_winter.pdf
    • https://s3.amazonaws.com/vonusirukete/valizeluberoxozapigaxi.pdf
    • https://s3.amazonaws.com/sinamozagemoger/79759906168.pdf
    • https://s3.amazonaws.com/tibitexil/what_is_too_high_blood_pressure_for_surgery.pdf
    • https://s3.amazonaws.com/gofiguj/mavirogamin.pdf
    • https://s3.amazonaws.com/zamuriza/interview_questions_and_answers_south_africa.pdf
    • http://xoxigibutu.epizy.com/xubaluzowejuded.pdf
    • https://s3.amazonaws.com/jijumupade/factual_report_template.pdf
    • https://s3.amazonaws.com/nitajosasa/13030460954.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7d.bin
524d1227111758cc2554a5a08baabcd452cb95f7c428bad2d7d1277f8ada6bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 5648 bytes
font_01_sfnt_off0000fdad.bin
6b4cee48ef5e246d2249d9857549a8242bb07458945dbe3991c85d7e94ac5fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 10864 bytes

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