Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a45eca89364ca8…

MALICIOUS

PDF

82.8 KB Created: 2021-04-29 04:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8e3a963236332f3e9d2b443ff97854bb SHA-1: 2a2d1269ca424d5a02219fe4e700eadef63b5471 SHA-256: 71a45eca89364ca8249d9dad3918e3f831912bc7b24dff2a96b24f19b4f7a378
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=how+to+setup+elgato+hd60+pro+pc PDF link annotation
    • http://xevamoz.mygamesonline.org/how_to_cite_a_article_in_apa_style.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/0qifCDQ/tokedujojelulu.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/75119173362.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/nibapaju.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/hhBhggd/tedolezoniseponokuwalu.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/dwrXhcL/10571850116.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/2lEhj9U/agriculture_class_10_cbse_notes.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/januserelu.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/1cmicgj/63106709895.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/hOTVyyK/avancemos_1_online_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/8jekjhY/2313882477.pdfIn PDF document text
    • http://pifafixejizigu.scienceontheweb.net/2020_kannada_calendar_free_download.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/710836130.pdfIn PDF document text
    • http://narawodosure.medianewsonline.com/nixefipulipez.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/fundamentals_of_accounting_icai.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/jiTXzZ4/download_photo_editor_apk_for_android_2._3.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/lorifawuvawot/demand_for_payment_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/bunoxovabuwomo.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_b38c42d47a404799a5eb05da4e67027a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/murudute/how_to_sew_simplicity_patterns.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_0185bebcb9ec4e6792271fc91d98fd6a.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_8e0994a9a90347feb4fd53473daf213f.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_c319d4b7f0bf4ccbbf322672ce5e3a21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/98854687582.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/cervical_screening_cytology_reporting_failsafe.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_7a7dd7f853164818b87ffebf0c921fb4.pdf?index=trueIn PDF document text
    • http://tonavisuma.onlinewebshop.net/pasiliravano.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_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 5684 bytes
SHA-256: e46d1586a7907e6e734912b17ea7e8285ac32695ce8216a4f3d18a1a85a9ab3c
font_01_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 12384 bytes
SHA-256: a6af689389d48b67f666e4084da20040e9234785a99d79d4f78c35b691122a24

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