Malicious PDF — malware analysis report

Static analysis result for SHA-256 056d8e110a05dfd1…

MALICIOUS

PDF

73.1 KB Created: 2021-05-17 07:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8efcf172a0ac73499ad307873753856f SHA-1: da33704712f29263ad1b2d2b43467ee9e6e793e1 SHA-256: 056d8e110a05dfd1fa7c4eea073c43386ec7b91b1024c675bf66f8421f9954f8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9997

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xezojetit.ru/strik?utm_term=is+it+hard+to+learn+html+and+css PDF link annotation
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/c92d0e7933ab549.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/4a5bed4a.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/4142271.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/amoeba_defense.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/49363105944.pdfIn PDF document text
    • http://noxavikadovul.mypressonline.com/validity_in_assessment.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/bbc_compacta_class_11_english_answers.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/qiahfhe/halloween_2020_cancelled_virginia.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/gaVhiiM/can_you_escape_50_room_2_level_14.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/xuxegoji.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/rutavusuzanixa.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/HjjhVge/jaxogusosewukobulelax.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/hihif6O/mojoguxusi.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/geaicjf/natural_beauty_regimen_for_face.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/yaesu_g-_450_xl_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefilodeza.myartsonline.com/metabolisme_protein_pada_unggas.pdfIn PDF document text
    • http://terumalok.atwebpages.com/best_to_word_converter_online_free_without_email.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/how_to_reset_inverter_aircon.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_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 5116 bytes
SHA-256: 708c011204521bbde8fc8ada79cf93f6578ec132358f76e62aca12333c441e6d
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10468 bytes
SHA-256: 07cc0c6e3fbbbd1455ef1ab4ce586758821c0b6865fadbf64ba15726a6d4f803

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