Malicious PDF — malware analysis report

Static analysis result for SHA-256 7633b578e71d2302…

MALICIOUS

PDF

76.9 KB Created: 2021-03-18 01:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a0b9ac023f2638951311508a4b6969c4 SHA-1: 70c02a697d809ce7624b8974453ddda209072841 SHA-256: 7633b578e71d2302d42e3561dcde41421b88e7cfc736e0b4eb2ddc2dbad8c031
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The embedded content, though heavily obfuscated, suggests a lure related to 'busybox pro android apk'. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites.

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://zajinet.ru/wix?keyword=busybox+pro+android+apk PDF link annotation
    • https://kusopexel.weebly.com/uploads/1/3/4/5/134526262/b5577209.pdfIn PDF document text
    • https://nagalijas.weebly.com/uploads/1/3/1/3/131398542/ba4a69d312.pdfIn PDF document text
    • http://sadovik.me/27544202628ly6qp.pdfIn PDF document text
    • http://wujumelugesebem.22web.org/can_you_void_a_contract.pdfIn PDF document text
    • http://goodnaturak.space/airpods_2_features_on_android9mm4h.pdfIn PDF document text
    • http://itclick.pro/pefawewitawijewobulojazekv0o8.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/vosimalume/poxedelu.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/anemia_falciforme_protege_contra_malaria.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/business_letter_of_invitation_to_uk_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/aci_mix_design_method.pdfIn PDF document text
    • http://toxalotivip.epizy.com/suzirugatinunovisisuw.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/moscow_metro_map.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/zisomasozebuzamedekanawew.pdfIn PDF document text
    • http://sivigowukom.epizy.com/personal_interview_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/vulerezuxev.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/bhangra_dj_dance.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/patient_appointment_scheduling_template_excel.pdfIn PDF document text
    • http://zuruxiwowasigu.epizy.com/magnetic_effects_of_electric_current_class_10_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/asme_y14_5_2009.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_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 5344 bytes
SHA-256: 34ed8f3e0acdb1b3389468f7ff28c7d3a4d39ff6028eea6e797dc78562749ff0
font_01_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 11304 bytes
SHA-256: 2955ca8accc82c99e731810d8802ba5471058769622aaf6cfc0c3f20a64c4111

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