Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4d1bec6aca633a…

MALICIOUS

PDF

72.3 KB Created: 2021-01-22 22:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a0cb2f3d3533beea094b2efd3e858ee7 SHA-1: b2577680aee91820464cf9914a7ccaf4db62a3a6 SHA-256: 6a4d1bec6aca633ae350faab4764f8f9b0628250dca1a1494fbc11fc4dc5b9f3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'druttle.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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=coin+gain+8+ball+pool+game PDF link annotation
    • https://site-1168485.mozfiles.com/files/1168485/54907506495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472479/normal_5ff97dff80b88.pdfIn PDF document text
    • http://dewobazul.22web.org/android_tv_remote_key_code.pdfIn PDF document text
    • https://site-1247386.mozfiles.com/files/1247386/welurubimi.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/manual_audi_q7_2017_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fc56e587e8d1.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/f0eb1023df93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5fd94155be27c.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/nupotukig/anxit_de_performance_scolaire.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/fields_of_gold_piano_sheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/el_materialismo_histerico_xavier_velasco.pdfIn PDF document text
    • http://funuduki.rf.gd/66110677544.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/66798010327.pdfIn PDF document text
    • http://wedizakur.epizy.com/bridgewater_market_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/92299173329.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/offline_browser_pro_apk_revdl.pdfIn PDF document text
    • http://vutakeba.epizy.com/fubup.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/ridotafomaxekukava.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/missguided_uk_reviews.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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 5104 bytes
SHA-256: 7febe356036ac1752a993db3c01d11d48954b976a1b46361feedc1cb3a86f5e3
font_01_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 10560 bytes
SHA-256: 7abb1ab0b30eefcebae9126d8bf0fd0c3a4c680f1abf586d0fef228340dcdc66

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