Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3e8659296d18c3…

MALICIOUS

PDF

68.2 KB Created: 2021-02-14 05:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 238ffc247df103c362c14021aee3bc11 SHA-1: 7fd458aa9b60cd1433e56341d354bed23adc5f5d SHA-256: eb3e8659296d18c359c89629b46a83df947ba29063784fa3b24d9a8b8346c8dc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, https://druttle.ru/123?utm_term=egyptian+pyramids+worksheet+ks2, suggests a lure related to educational content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further indicate malicious intent, likely to redirect users to malicious or scam-related content through the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=egyptian+pyramids+worksheet+ks2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470678/normal_600354c0aebde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5ffaaa4a48803.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/ejjygdZ/21678646301.pdfIn PDF document text
    • http://nibofope.66ghz.com/19818076059.pdfIn PDF document text
    • https://fanolukexepafo.weebly.com/uploads/1/3/0/9/130969893/sogumirerob-gotizugaziweke-zasezodedex.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/8168747.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/zosetabowepebu-xesogojogulif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449777/normal_5feebe1ebe923.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/bIOwYja/lucky_slice_food_truck.pdfIn PDF document text
    • https://xetetikagidol.weebly.com/uploads/1/3/5/3/135308020/4560089.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/ZNhjhfQ/hashtags_in_portuguese.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/hhijjZ6/rc_car_parking_2_2020.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/zaxedeser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404490/normal_5fe5d28e52925.pdfIn PDF document text
    • https://xezagepu.weebly.com/uploads/1/3/4/9/134901129/8054230.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/ihZjjuu/38022369462.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5fdd18de245b2.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/sudexuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xorabaza.rf.gd/49499775624.pdfIn PDF document text
    • http://lelirovosas.epizy.com/business_english_books.pdfIn PDF document text
    • http://fovuderes.rf.gd/87071153282.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_off0000cd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD54 5688 bytes
SHA-256: dace942c4e56939285078f7ca3440f1272ef15f3b79fff6b086efe51794ad2ca
font_01_sfnt_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 10140 bytes
SHA-256: ad548053cfc7fa1e8e1496ce23017556b9e7fec44d471f9b131f7b4168af1850

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