Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0af4161cd6ed4e8…

MALICIOUS

PDF

67.0 KB Created: 2021-02-24 08:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 40faf58189e5404253287b002a3bcd7e SHA-1: c79fdcaea1461e740c4441f5d03aa4e0b4835214 SHA-256: f0af4161cd6ed4e8ffb07c1174142ed59ef5261dde89caa7a65f6976ace63396
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one notable example being a redirector URL that appears to be part of a link farm hosted on disposable domains. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful 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 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=a+wild+sheep+chase+dnd+pdf PDF link annotation
    • http://felidefewipikig.22web.org/bearcat_bc350a_scanner_manual.pdfIn PDF document text
    • http://xitaboketeloba.iblogger.org/how_to_report_police_misconduct_anonymously.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_5fda66f2de02e.pdfIn PDF document text
    • http://faxizila.iblogger.org/53355923962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393181/normal_5fcd3a00dcd05.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/divikufifir/sifufeguxumujirewozeru.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/biology_class_9_chapter_5_question_answer.pdfIn PDF document text
    • http://potelodifudoduj.epizy.com/astrology_answers_adrian_ross_duncan.pdfIn PDF document text
    • http://sisigetevi.rf.gd/symbol_ls2208_laser_barcode_scanner_manual.pdfIn PDF document text
    • http://biborufa.epizy.com/ezreal_adc_guide_op_gg.pdfIn PDF document text
    • http://jutefuzu.rf.gd/miwire.pdfIn PDF document text
    • http://xuvawesap.epizy.com/pretty_little_liars_series_free.pdfIn PDF document text
    • http://melurijaniloxa.rf.gd/printable_amsterdam_map.pdfIn PDF document text
    • http://welidigukiru.epizy.com/vaguxirapewa.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_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 5228 bytes
SHA-256: df92e190ae13986d4e28f7c09f5e9b38ff6b4c400f97ca3abd5f5edb75ea3658
font_01_sfnt_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 10068 bytes
SHA-256: b5074e90ee68499e2f0ced4d0ff8bb7a5dbbc114ba97e94deee770dcff61ce42

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