Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ff6fe9fa0a102e…

MALICIOUS

PDF

80.0 KB Created: 2021-02-02 08:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8e8495acf14b819b5567adbe9db47ea2 SHA-1: 42156728179d9ab2f060fe4f8f17b3ec1ee7407e SHA-256: c6ff6fe9fa0a102eb7f17945acf368cd36de6a5fac8308baeaef9b51b14db317
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically phishing and trojan activity. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malicious redirection scheme.

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 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.
  • 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://druttle.ru/123?utm_term=matter+and+energy+study+guide PDF link annotation
    • https://cdn.sqhk.co/jiluputumusi/7KFgggg/88961107167.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/hjWiihj/grand_theft_auto_v_the_manual_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/gHq4Kjg/wemujatugaxebiginadene.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/vifw5ge/27830398319.pdfIn PDF document text
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/nugijogabuwex.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/jcieXjb/free_poker_texas_holdem_classic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_600a22ea47519.pdfIn PDF document text
    • https://mosevulex.weebly.com/uploads/1/3/4/8/134860143/tolodizuvegora_babakivivu_ledigalo_zizirijenumafu.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/yCLiatn/sinezevexudevifejovigelol.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/hduhehh/73891552847.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoselubiki/idjcoAa/83273311624.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/tabubositiladag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kagedatabujo/teaching_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/dungeons_and_dragons_3._5e_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/scratch_2._0_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/zabuvosofufewubelula.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 4840 bytes
SHA-256: f4237fa0d36530e1eecfefaacf7fb0b4f1df9d5b7df88654026d44977609da3b
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 10936 bytes
SHA-256: 07f50bfd9788896c58e8037ce367600021b3cb22127d38de4aececc2bb166975
font_02_sfnt_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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