Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ca4667b4aa9f13…

MALICIOUS

PDF

86.2 KB Created: 2021-03-22 10:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9127f47e1ceca4f35f4580ed9c017e3 SHA-1: 1bed817ccb95bd73dc9652f57db1ff84d66221d0 SHA-256: b4ca4667b4aa9f137d28ad61073c9cd08c75a66f3ebaf2cd75e2d9dbd77009fb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and embedded URLs suggest a lure to external websites, potentially for phishing or to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fokemale.ru/award?keyword=esame+celi+5+pdf
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/c74e8df5f.pdf
    • http://bugosegu.scienceontheweb.net/stock_market_crash_great_depression_causes.pdf
    • http://jalosus.mygamesonline.org/77207538563.pdf
    • https://lupemofuxuxutuj.weebly.com/uploads/1/3/1/3/131383332/3ec25f1c8b98deb.pdf
    • https://static.s123-cdn-static.com/uploads/4411915/normal_5fed491eef9ba.pdf
    • https://static.s123-cdn-static.com/uploads/4449998/normal_6004a4d0c77e4.pdf
    • https://cdn-cms.f-static.net/uploads/4390056/normal_6018c809efbd1.pdf
    • https://latafuxez.weebly.com/uploads/1/3/0/7/130740260/wujuzufuwis.pdf
    • https://cdn.sqhk.co/kufalavoxig/rpii14L/98492627102.pdf
    • https://cdn.sqhk.co/fasazani/muKihja/39415942613.pdf
    • http://jiteruruw.sportsontheweb.net/sony_icf_cs15ipn.pdf
    • http://vegimawubukuwon.22web.org/trastorno_de_personalidad_anancstica.pdf
    • https://cdn-cms.f-static.net/uploads/4420760/normal_60163caed75b5.pdf
    • https://cdn-cms.f-static.net/uploads/4413347/normal_601bb398487d2.pdf
    • https://vebudizegegogog.weebly.com/uploads/1/3/1/3/131398423/rebatikanawoli-gizeju-ranesafabutokik-wifonu.pdf
    • https://cdn.sqhk.co/kovezozeseg/ggECja5/ninety_six_sc_weather_radar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dowulutidapewu.epizy.com/7306144140.pdf
    • http://fanalejowegop.atwebpages.com/24518635178.pdf
    • https://uploads.strikinglycdn.com/files/d7b6d0c3-168e-4fbf-974c-1b12b426d132/change_management_theory_in_nursing.pdf
    • https://uploads.strikinglycdn.com/files/764921fb-e9c2-490d-b246-b279897df18f/which_character_in_les_mis_songs_on_my_own.pdf
    • https://uploads.strikinglycdn.com/files/65c3b2cc-29ee-43f0-a16a-bf1c567117a9/what_is_the_name_of_first_harry_potter_movie.pdf
    • http://bogalibamadom.myartsonline.com/muxorudawafavadam.pdf
    • https://uploads.strikinglycdn.com/files/6b26019d-4cf1-402d-b458-d6a21068e7e6/38659164433.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_off00011087.bin
1d617ef38f0cfd5671a1aa016e086d4a3b599d72f422352888c8f8ff58a6de6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 5284 bytes
font_01_sfnt_off0001227d.bin
5a8d6c8e39476d42df1716b428215b6337d1a3b1eb3d167dcd44690eb86fb62a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 12752 bytes

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