Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14e8e693a85ded7…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 13:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 88ee8562bb52c486420752d57d60ea16 SHA-1: 546302440e3abc7b746352e92bdd45cefa899a42 SHA-256: c14e8e693a85ded7d1a10f0adaa5f9f7431231d9a696e3eef63404680140a5bf
134 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. It uses an invoice-themed 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 0.9998

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://maypoin.ru/aws?utm_term=how+to+record+accrued+interest+on+notes+receivable PDF link annotation
    • http://hesap-al-sat.com/rokawowumeluwukobagadugp6d28.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/Ggciaja/zurijimesurajoxafa.pdfIn PDF document text
    • http://alkostore.xyz/visual_basic_book_by_sushil_goelje06p.pdfIn PDF document text
    • http://instapriz.website/can_i_use_google_maps_directions_offlinexcf3c.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/sin_tu_amor_yo_soy_nada_in_english.pdfIn PDF document text
    • http://trysucre.pro/jumbled_sentences_for_class_1y520l.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/P3gdhf7/54395124037.pdfIn PDF document text
    • https://cdn.sqhk.co/gobonuzuwif/AibjcpQ/formula_1_mobile_racing_forum.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/deism_vs_theism.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/fuhcldz/galaxy_theater_cannery_hotel.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/XggfjdT/dragon_drilling_services_ltd.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/cjXVlie/peruvuru.pdfIn PDF document text
    • https://cdn.sqhk.co/nobuwinulad/hLIYhcP/kamikochi_autumn_report_2019.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/buongiorno_principessa_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/ejdgd0Q/animal_print_runners_for_hallways.pdfIn PDF document text
    • http://vehicleusains.com/683983449857s3l.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/ioxifgi/69925684387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawirir.atwebpages.com/unit_forces_law_of_universal_gravitation_worksheet_answer_key.pdfIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/letter_c_activities.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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 5184 bytes
SHA-256: 1c2cf83be5d9cd8907488492116de766f9f040d16449fbf9ef90622601650cbd
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 11648 bytes
SHA-256: c2fb44ea224065cafa64d75f9f140bb8149e665e0a446270553153b6547757a2

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