Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64869820fd9facc…

MALICIOUS

PDF

77.2 KB Created: 2021-02-13 17:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 367a070931abdfb4c9d57b3bbfe4fae6 SHA-1: 8b47b5d01659ba4a2b61ec1c1dd06aa541d8f6de SHA-256: d64869820fd9facc0a5dc83df54f4e4cd938cdf755df431c1f896b67414a3426
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external links, with one example being https://cdn.sqhk.co/pivugisaxap/Rzgjgfr/gangs_of_london_netflix_trailer.pdf. Another embedded URI, https://jacksth.ru/123?utm_term=the+mindbody+prescription+review, further supports the lure-based attack pattern. No scripts were extracted, but the overall structure suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=the+mindbody+prescription+review PDF link annotation
    • https://cdn.sqhk.co/pivugisaxap/Rzgjgfr/gangs_of_london_netflix_trailer.pdfIn PDF document text
    • http://sedopusomivul.22web.org/amiga_roms_pack.pdfIn PDF document text
    • https://vekiruwubutut.weebly.com/uploads/1/3/1/0/131070393/jepozeju_manotota.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/dopuwiwaxi-junomuxumex-toxifekobubor.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/i6haDE0/tixudedu.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/tobovunoberiki/baxabazisenor.pdfIn PDF document text
    • http://zijipowatik.epizy.com/gukabukijidute.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/79829829626.pdfIn PDF document text
    • http://relilirijupike.epizy.com/65659520127.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/gradle_tutorial.pdfIn PDF document text
    • http://tituroxir.rf.gd/course_completion_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/91321770489.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/waverley_junior_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/fox_news_weather_reporter_chicago.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/cavernous_malformation_brain_causes.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/travel_expense_report.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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5412 bytes
SHA-256: c1da2f93a686436ce14cab1173bc23417ecacd08b260bbe27c3803f03ba8d007
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 10492 bytes
SHA-256: 5478e337b011b6a8a99fe08eb0dba9b0d1a00f19f180de048e7e06170adb21af

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