Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b62b5b20ae9899…

MALICIOUS

PDF

78.0 KB Created: 2021-02-01 12:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 28f200e80abedbbec3e47f0d46bcfeee SHA-1: b82c479b83586811e5da42dc5b28ba1384878f34 SHA-256: 19b62b5b20ae9899a8250851103ca1e34d62b5f3a141b60ba0712d4bc25348e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting domains. The primary malicious URL identified is https://seumenha.ru/123?utm_term=deprivation+and+satiation, which is likely used to deliver a secondary payload or conduct phishing.

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://seumenha.ru/123?utm_term=deprivation+and+satiation PDF link annotation
    • http://dikiradojasika.iblogger.org/answers_on_a_postcard_expression.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/GurQrjh/2405274768.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/hjaI6ji/setixurukezelozepilolilu.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/D2ghjei/vowapunanokun.pdfIn PDF document text
    • http://sofabufakuzod.22web.org/gaporubebavobiwalo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwisowaf.rf.gd/clash_of_clans_apktops.pdfIn PDF document text
    • http://vonikolodu.rf.gd/27099929293.pdfIn PDF document text
    • http://bovifuxabobi.epizy.com/78368966596.pdfIn PDF document text
    • http://gogolozumer.epizy.com/nigetes.pdfIn PDF document text
    • http://bedekopezedegej.rf.gd/78394313520.pdfIn PDF document text
    • http://fapegilijaz.rf.gd/extent_report_using_cucumber.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/taxokuvadodozidovurafimup.pdfIn PDF document text
    • http://pavasokunise.epizy.com/admission_form_aiou_continue_students.pdfIn PDF document text
    • http://durozebexonadop.rf.gd/allianz_sigorta_hasar_ihbar_formu.pdfIn PDF document text
    • http://pepajefosub.epizy.com/addiction_severity_index.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_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 4980 bytes
SHA-256: 1ef43c4662075c4ed1486fc578ecdbbfeb5541e98a85e4c0c6322dce75648588
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 10612 bytes
SHA-256: 32d1c224cfd34a2eeabbb8677241eb22ed3df51b738f9b8481599dd0e3f253a1

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