Malicious PDF — malware analysis report

Static analysis result for SHA-256 479b7f81ab0086b9…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 14:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c28d16e6895818f1d2a627bd207a5b06 SHA-1: 9541b1535b993a60bda335314dda09c1812d6034 SHA-256: 479b7f81ab0086b937d7068a931f4246c854f6cdf8a2d5e6c7668dc744a8bf80
156 Risk Score

Malware Insights

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

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 0.9997

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 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.
  • 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://golowaki.ru/strik?utm_term=how+to+use+mr+coffee+iced+tea+maker+3+quart PDF link annotation
    • https://garowenin.weebly.com/uploads/1/3/4/6/134662298/6578274.pdfIn PDF document text
    • https://wegevarudaredi.weebly.com/uploads/1/3/4/3/134356518/6934762.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/krups_12_cup_programmable_coffee_maker_reviews.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/54200737082.pdfIn PDF document text
    • http://kixalilabuzawov.medianewsonline.com/72900274257.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/qualitative_and_quantitative_data_analysis.pdfIn PDF document text
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/kojofijo.pdfIn PDF document text
    • http://kilekapalovuzo.getenjoyment.net/62273937683.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/navoburarovada/waiting_for_godot_play_script.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/mba_cet_2019_form_link.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/casterton_college_rutland_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/skype_for_desktop_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/6804087891.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/heil_furnace_part_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/80797745254.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/the_five_languages_of_love_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/tilajevaxugejovi.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/48612872455.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/modern_calligraphy_alphabet_capital_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/how_do_you_calculate_blood_flow.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/el_viaje_de_tu_vida_descargar_gratis.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_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 5540 bytes
SHA-256: 5bbcff4801a4702901605d9a925bbafb7a110acfec680556681effaa31bad436
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 10728 bytes
SHA-256: 2c3af3e2fc6972189326e1e15e5762ac355313823e3e1e1834b664ec566c43fc

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