Malicious PDF — malware analysis report

Static analysis result for SHA-256 012b81bd06ce692b…

MALICIOUS

PDF

82.7 KB Created: 2021-03-01 19:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 203bc923177b14888d44e2b5103b67d1 SHA-1: c0163c3372ef511a00ca1e077bb1d84ac73c0572 SHA-256: 012b81bd06ce692b940d6eb391d6d8fbff362f722c766062040a959f2bf9719f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms used to distribute malicious content or conduct phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the intended purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/award?keyword=epson+perfection+v550+vs+v600 PDF link annotation
    • https://cdn.sqhk.co/rapovixovuti/fPtjeFd/bluestone_walkway_stones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5fda8b065dee3.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/52984949168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_5fd731b3a1fd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd385fe5270f.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/grimoire_meaning_in_arabic.pdfIn PDF document text
    • https://cdn.sqhk.co/buxotulato/jJ1hajg/18735266001.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/where_to_buy_sunbeam_electric_blankets.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/tixodunusilakubezumamop.pdfIn PDF document text
    • http://lesagotefawa.22web.org/7914502023.pdfIn PDF document text
    • http://rukawagamijo.iblogger.org/asthma_action_plan_form_ct.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/0g7xUNY/86828685709.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/summer_waves_16ft_elite_frame_pool_reviews.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/how_do_i_connect_my_tp_link_smart_plug.pdfIn PDF document text
    • http://sukozuxari.22web.org/cordless_phone_with_answering_machine_panasonic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubuvajaroxe.epizy.com/ao_smith_takagi_tankless_water_heater_manual.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/sedekobujapedimefegefike.pdfIn PDF document text
    • http://xebinuv.rf.gd/how_to_use_in_command_prompt.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_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 5204 bytes
SHA-256: d63864f8c9b5ae28902f8ba06773c1a5d313ea8667df117fbb70f3d915da52ff
font_01_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 10496 bytes
SHA-256: 10210c2e9d77210edfe09f3e5c8a3a779a9c5e9c3796799dbc8f325c0c1473b6

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