Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf83f761e874991…

MALICIOUS

PDF

75.8 KB Created: 2021-02-09 08:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5a746692df6fa16ed4588ce71411a5c7 SHA-1: 8a9861ce41baab90a8b1607a0a77f18b37440a3c SHA-256: 2bf83f761e874991f07bd236a39c06b3a34cb124b8898aa78ed0a08109328b55
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and CDN domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution 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://baarspo.ru/123?utm_term=300zx+manual+boost+controller PDF link annotation
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/piwirarivirowizisimo.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/ghgjfhc/war_world_tank_2_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/Pjjicjj/stickman_legends_warriors_shadow_war_mod_apk.pdfIn PDF document text
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/medawarebixodez_lozule.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/9e4c4abe7fa4283.pdfIn PDF document text
    • https://cdn.sqhk.co/gokitoser/QjhYNja/duzediberomab.pdfIn PDF document text
    • https://zageporipemaza.weebly.com/uploads/1/3/4/5/134507549/9139794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_5ff88db322988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5fd388d3c364d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5fdd700fec9f6.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/A13ghja/kufilezonobama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_601aca980f9ed.pdfIn PDF document text
    • https://cdn.sqhk.co/nizaveni/cOgf5ii/dogavuvubosutafikanaguzu.pdfIn PDF document text
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/5884269.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/40ecef60bf1b.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/juwofuxufijup/area_and_perimeter_of_circle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/21983547653.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/wurikivasuxanijoz.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/wobobixoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/buterusolux.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_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 5416 bytes
SHA-256: 2396c91a70948027a5a546bcd984bff62ee52010805baccebda770ea3a165b3c
font_01_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 10708 bytes
SHA-256: fcfa972cf836f1ccf308a7c93f901dc881b39f4e579203f0e4066df16f7f981f

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