Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc80fdc7ff6c56c2…

MALICIOUS

PDF

82.8 KB Created: 2021-05-02 15:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 451361cf655367bafd3d622e79396fb2 SHA-1: db753140edfb7c5adc94f63adabee68fee33fd15 SHA-256: cc80fdc7ff6c56c2d373ea506e8715c50a328cc3950a1d4b4bc8d7c300a92a0a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs and the document's structure suggest an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=onkyo+tx-sr608+hdmi+problems
    • https://cdn-cms.f-static.net/uploads/4452863/normal_6054d419a0195.pdf
    • http://webmastervlad.ru/hoja_de_4_columnas_contabilidad_form55rqz.pdf
    • http://intereriia.com/wasinajiwuzewonatoworebazqggjq.pdf
    • https://static.s123-cdn-static.com/uploads/4444377/normal_5ff41b5b41ac8.pdf
    • https://cdn-cms.f-static.net/uploads/4445125/normal_5fd6ea3acb9f8.pdf
    • https://cdn.sqhk.co/metusoteliza/ghgjrif/impossible_bike_stunt_3d_mod_apk.pdf
    • http://politach.com/gixixollrqw.pdf
    • https://cdn.sqhk.co/pebekaja/KACzjan/pencil_case_box_price.pdf
    • https://cdn.sqhk.co/xelalizogim/hgijgzR/my_airtel_coupon_engine.pdf
    • http://austritkfa.com/36609249954pizlx.pdf
    • https://cdn.sqhk.co/zesozote/ajghbTv/4819677223.pdf
    • https://cdn-cms.f-static.net/uploads/4485579/normal_6020049106e79.pdf
    • http://qlemelest.online/43069220231cna51.pdf
    • https://cdn-cms.f-static.net/uploads/4366014/normal_6039bf81b3513.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kelukakeb/grammar_checking_software.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/html_format_text_as_code.pdf
    • https://s3.amazonaws.com/dowesitobuga/lapudopujokovixekivematu.pdf
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_3f1fef6959744921988e4f6aa1a2ae06.pdf?index=true
    • https://s3.amazonaws.com/fezenur/knicks_news_bleacher_report.pdf
    • https://s3.amazonaws.com/wunojipu/interview_questions_and_answers_for_networking.pdf
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_49ba80cc63864372bd70241ed9ea03ef.pdf?index=true
    • https://s3.amazonaws.com/jotizifime/blank_ukulele_chord_chart.pdf
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_14b9d20314c744078094392cfd3e9166.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c6.bin
72f969530978eb271ef5d4c4167e39817d6a35c9ee5f21f90caee7b89454d182		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 5700 bytes
font_01_sfnt_off00010904.bin
05f079b42d3429a0e271e0c959e2bc5ab05fe017df26a80522f52a2d09a66f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 11676 bytes
font_02_sfnt_off00012f89.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 4324 bytes

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