Malicious PDF — malware analysis report

Static analysis result for SHA-256 7703c47dac7d1a37…

MALICIOUS

PDF

77.1 KB Created: 2021-04-03 11:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d00fbe5a806b76999c84634302a4e983 SHA-1: 7f2f495e30210360c644e04afe9d881835da4aab SHA-256: 7703c47dac7d1a3758151f3eff8a84d0ecd56c8f3b6bc19bdcb410b290b3d0c1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=what+is+the+best+medical+assistant+exam+review+book
    • http://rabota-plus.club/ez_go_golf_cart_steering_problemsdegay.pdf
    • http://selozufuwadapuw.66ghz.com/biomes_of_the_world_worksheet.pdf
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/dulifiwum_mobuvexumotasev_vulum.pdf
    • http://pressit.fun/kuzesubanimosutugezoweeiq0z.pdf
    • http://kivekedu.iblogger.org/upsc_mathematics_syllabus_2020.pdf
    • http://ita-women.space/grand_theft_auto_online689fr.pdf
    • http://vizenam.medianewsonline.com/bolt_dimensions_chart.pdf
    • http://optalpha.com/lezituxavifokalira80kkm.pdf
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/8780ed624.pdf
    • http://bojapebonan.22web.org/rexulokinitulikasu.pdf
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/6692300.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jozobudesurarab.onlinewebshop.net/what_are_the_properties_of_transition_elements.pdf
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_ec6034f2fed342ef99760bdc95be0e17.pdf?index=true
    • http://vilumepidiwego.myartsonline.com/63151281143.pdf
    • http://tekojexabutixas.epizy.com/yowhatsapp_apkpure_versi_terbaru.pdf
    • http://bozuzosigakewa.rf.gd/bronchiectasis_severity_index.pdf
    • http://zurovobira.epizy.com/fizadepun.pdf
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_e3a5c61b4c20429eb76e093772e286f6.pdf?index=true
    • http://wufuxabarerinuw.epizy.com/toxizasuxipagixisewoj.pdf
    • http://dolanuvusipegu.myartsonline.com/night_shift_movie_theme_song.pdf
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_c86611ab81354e74825dc774d1ae60f3.pdf?index=true
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_04923ecd87ce4b67ab7f2c757bb0e143.pdf?index=true
    • http://maxunifox.epizy.com/what_are_the_three_3_methods_of_heat_transfer.pdf
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_742f14aa4d3044f78787fd4a4928604c.pdf?index=true
    • http://beliraguw.onlinewebshop.net/the_year_of_you_365_journal_writing_prompts_for_creative_self-discovery.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eede.bin
02435e78a2a1ed1f0b4117c289900d46d5e21ae1fc98ac658751d3806636020f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 5616 bytes
font_01_sfnt_off000101e5.bin
e6b1ac9284176eadae2fe36e302bbe44333d36d35d3a1edbbaf2512a849abc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 10272 bytes

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