Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a56b90deccf8c5…

MALICIOUS

PDF

73.6 KB Created: 2021-02-25 14:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 7bae942254a22fa31a6eebe0b0b032fd SHA-1: 1c0ba2e070d6f988025f2fd1ca2c1541b770b08f SHA-256: 51a56b90deccf8c50ec8e432a2eae844a11a0a26759493db633ce43c7120f9eb
146 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/wb?keyword=how%20to%20set%20sprinkler%20timer%20isa%20304 PDF link annotation
    • http://xulubapatoso.scienceontheweb.net/balancing_equations_worksheet_answers_1-20.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/50037805858.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/duhjSig/43100304743.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/pengertian_adt_android_development_tools.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/eAcUnhb/12722773094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_6036c3c557935.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/what_is_a_good_stride_length_for_an_elliptical.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/2020_starcraft_mossy_oak_ultra_lite_311bh.pdfIn PDF document text
    • https://cdn.sqhk.co/sobilowibid/hjojhMq/lausanne_2020_hockey_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/juzilolawu/ijegdjh/gudolakasekovu.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/eSUFNge/best_games_of_2020_so_far_xbox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fd1b05d8bb14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezevenakos.myartsonline.com/gutejela.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/cost_accounting_a_managerial_emphasis_chapter_4_solutions.pdfIn PDF document text
    • http://litorow.myartsonline.com/pegireravemekexesuxopob.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_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 5476 bytes
SHA-256: 6c0e612376bc0a4f270c2d5168046166101e027cafa6c2492a031167d3bb4a02
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 13848 bytes
SHA-256: 7b87291888f38be48f65b01e0f4393a56b09250f7ccf12b3ea98ad1d2daa78d4