Malicious PDF — malware analysis report

Static analysis result for SHA-256 4724c638ba53e895…

MALICIOUS

PDF

134.4 KB Created: 2021-02-24 02:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ad593f0a9380a346284b33be17c07722 SHA-1: c77e5fd2bfd2d8387165594964c8a6b90168a122 SHA-256: 4724c638ba53e89548e87c69b3c746121492e8798eaa7c1f62b470e474394532
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farm SEO scams or to redirect users to malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, and a critical heuristic identified a mass external PDF link farm. The embedded URLs suggest an attempt to drive traffic to potentially malicious or deceptive content.

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://maypoin.ru/123?utm_term=plan+y+programas+2011+tercer+grado+de+primaria PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402951/normal_5ff60b321dbc3.pdfIn PDF document text
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/zakaxofidutu.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/e94851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499656/normal_5fe1543142412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_60355850e94fe.pdfIn PDF document text
    • https://domazatavaxagit.weebly.com/uploads/1/3/0/7/130775902/8809300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367927/normal_60043c24a5a65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_601ca7e7e7553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367007/normal_5ffa376952c53.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/bededuxotulapil/axios_a_file.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/blackberry_bold_9900_os_6.pdfIn PDF document text
    • http://vusegax.rf.gd/dirt_devil_pro_express_ud70170_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/telling_time_practice_worksheets_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/bezawada_bebbuli_songs.pdfIn PDF document text
    • http://towidono.rf.gd/selenium_framework_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/devefuderojilakep.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/vivo_ipl_2018_anthem_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/how_to_collect_a_small_claims_judgement_in_arizona.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/uniform_circular_motion_and_centripetal_force_lab.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_off0001cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD0E 5820 bytes
SHA-256: 1fed1a48bfa7efaba17e9c835ebc6afd99e0c82f6a1eb1108068c1c78cc3805f
font_01_sfnt_off0001e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0DB 12828 bytes
SHA-256: 7d3edb081c1a4fa306c1348f2b538c9ef822f9142183a3c937c76f94b32cfb14

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