Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd162da43012a5e8…

MALICIOUS

PDF

85.7 KB Created: 2021-03-25 17:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a639315fc144d1e8c8a137838e76d7f SHA-1: 72cce9f4e27d9b79bc930c89a50fc58a97ea71b1 SHA-256: fd162da43012a5e8659abf380fa88efdda63e6ac91277245ff7682d7a1359d81
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/award?keyword=types+of+roller+bearings+pdf PDF link annotation
    • http://powerhdniy.space/42870991450cc8nk.pdfIn PDF document text
    • http://ctuxuu.com/diggro_user_manual_s2n900u.pdfIn PDF document text
    • http://copyrightsupporteds.com/shipping_up_to_boston_sheet_musiceiktw.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/MhfifDD/sudoku_solver_online_8x8.pdfIn PDF document text
    • http://tryse.xyz/sri_rudram_chamakam_sanskritarmf6.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/hfhegd8/duwonezewasimonadom.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/7iiihqX/20_levels_of_counting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470545/normal_6041607f4a96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_600d713a49b5a.pdfIn PDF document text
    • http://csxmoney.info/what_does_the_raven_symbolize_in_the_bible35ten.pdfIn PDF document text
    • http://vertitribe.store/icmr_nutritional_requirementslftzx.pdfIn PDF document text
    • http://cucoupon.info/dancing_plague_tank_guide16ste.pdfIn PDF document text
    • http://afterdealer.pro/line_plot_worksheets_for_4th_grade3ev0f.pdfIn PDF document text
    • http://revershjtb.site/how_to_install_verizon_4g_lte_network_extender_2e348a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://davofunup.onlinewebshop.net/jeborinopifolalodo.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/school_essay_in_english.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 5108 bytes
SHA-256: 63bd08ac9d725c93a60c9042aa6fc9a9451ee24eb998b66a7debfe49848f1de9
font_01_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 10600 bytes
SHA-256: 5e5dcc76e95242a2d3c3005acf50d71c7c02a3499ae901d7230eb81c68dc8836
font_02_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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