Malicious PDF — malware analysis report

Static analysis result for SHA-256 914793c6b5f0c620…

MALICIOUS

PDF

75.6 KB Created: 2021-03-25 08:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4710ff087fee82e80b0684b2405c352c SHA-1: 1d851c0f8d8f246a99d916e8b5a933e2caa87c42 SHA-256: 914793c6b5f0c620a13db31c8bcf1a84ae7d9eb2be904ca9913bed80f22cbd76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=guidelines+for+medicaid+ny PDF link annotation
    • https://cdn.sqhk.co/womilepeba/vhjUHG2/nfl_network_thursday_night_football_commercial_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/juvekuvop/hhakuhg/beiimaan_love_video_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jzjjmjz/voxetutipewawemelo.pdfIn PDF document text
    • http://inostrana.com/dupalebuzagisapopujirh3cu1.pdfIn PDF document text
    • http://zoo-taxi.site/what_is_social_realismpys2e.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/agehgfF/subway_runner_map.pdfIn PDF document text
    • http://tb-films.ru/97811975766mqsji.pdfIn PDF document text
    • http://momezalomakejo.22web.org/39589892156.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/bhd99w5/bow_mania_apk.pdfIn PDF document text
    • http://vekeludin.iblogger.org/tiwilorenikofafoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/mefivujosawo/jC7hijd/tajuwijubirutipatafi.pdfIn PDF document text
    • http://sizinepizot.scienceontheweb.net/national_geographic_magazine_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/iggdifX/fojafadezijugom.pdfIn PDF document text
    • http://zonagareme.getenjoyment.net/acute_abdomen_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giritinip.epizy.com/durebolipopinuv.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/maastricht_university_phd_thesis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/compound_personal_pronouns_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/sustainability_reporting_singapore_stock_exchange.pdfIn PDF document text
    • http://paruwegugu.rf.gd/36360077636.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/tesasezomusolijikigimope.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/nalumuso.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_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 5300 bytes
SHA-256: 3b2138af93ba4af732af3ecd5f054a64b84f2c26dc99bb557e870aa2396733f0
font_01_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 11052 bytes
SHA-256: 7333178ea8009b0d86afa84609a9d56a1ee8891c3888863ec533c2525e1d556a

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