Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bacee69090cdb2…

MALICIOUS

PDF

65.0 KB Created: 2021-02-18 22:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 55999682932cfe2a0bef3f2a9d778e9b SHA-1: 79e663fe9e3b1f84ce552a2fffb58635c34ea4de SHA-256: 90bacee69090cdb2251aaf0dccfcfcf7f504caaba2dc26a285f72094672df3cc
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to a 'strik' endpoint, suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text related to 'Pearson edexcel a level biology textbook answers', indicating a lure to trick users into clicking the malicious link. The presence of multiple disposable domains and link farm heuristics further supports the malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=pearson+edexcel+a+level+biology+textbook+answers PDF link annotation
    • http://gipawavanitexe.22web.org/63987109658.pdfIn PDF document text
    • https://zapadakutomar.weebly.com/uploads/1/3/2/6/132680787/xifukebo.pdfIn PDF document text
    • https://cdn.sqhk.co/jovojatubo/jshavpO/upholstered_daybed_office.pdfIn PDF document text
    • http://maxidadikegi.iblogger.org/kibofobopudobeguz.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/ijIhfR7/sovulufamawotajasusil.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/bewokasome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovajiw.rf.gd/603141369.pdfIn PDF document text
    • http://sakolizel.rf.gd/aqa_physics_year_2_textbook_answers.pdfIn PDF document text
    • http://lomurobutu.epizy.com/assetto_corsa_adam_lz_240sx.pdfIn PDF document text
    • http://gigivixegaxun.epizy.com/yooka_laylee_impossible_lair_achievement_guide.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/tonaruxalomuwidaram.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_off0000c13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13E 5632 bytes
SHA-256: d81fc6520e9ebf8f9bbcb1de384320c9de8c2e8e370373fe8841749b68a2f605
font_01_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 10100 bytes
SHA-256: df68571a29b3ba4b48c2bc085b535689c3408859f8602ea1a6c029199faaf2cd

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