Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c87c86ad4b42f2b…

MALICIOUS

PDF

69.1 KB Created: 2021-03-05 00:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f8f53726d87b3e51e860ec4d67af3189 SHA-1: a21d52e153ac4630ffaa9eae5d383369c0cac012 SHA-256: 7c87c86ad4b42f2be8a0de1f704981b9d233e97f3d9a1d999d7bca869f67d481
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are associated with link farming heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to a Microsoft keyboard, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=microsoft+sculpt+ergonomic+keyboard+usb+receiver PDF link annotation
    • http://xemakaze.mywebcommunity.org/60642265272.pdfIn PDF document text
    • http://vidoroxujo.22web.org/der_lehrer_serienguide.pdfIn PDF document text
    • http://replyua.site/4435457838292p9y.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/security_guide_to_network_security_fundamentals_5th_edition.pdfIn PDF document text
    • http://vuxilenusip.mypressonline.com/66788404080.pdfIn PDF document text
    • http://wolapikugeb.iblogger.org/22398424205.pdfIn PDF document text
    • http://copyrights-notices-helps.com/ver_fox_sports_mexico_en_vivo_onlinem49yp.pdfIn PDF document text
    • http://porn77.design/99480907734l0ofu.pdfIn PDF document text
    • http://makeyourself.xyz/fusagusifobonugado8v0s5.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/xubat.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/pursuit_of_god_chapter_summary.pdfIn PDF document text
    • http://todayshop.website/84476988193uksfp.pdfIn PDF document text
    • http://dk-inc.xyz/blank_clock_worksheetsvwvy1.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/3703728295.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/35539c6b-9fc1-418a-998d-4dd887b01a37/revetixusepujuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84da7a6-419d-4ee4-8142-5ee556887350/rules_of_the_game_theme_analysis.pdfIn PDF document text
    • http://pajoxewujovero.rf.gd/vevo_music_app.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/how_to_write_titles_in_ap_style.pdfIn PDF document text
    • http://zepuwiz.atwebpages.com/thermo_king_t800_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3201efb0-13d6-483b-9324-97ac12cad60f/how_to_answer_ethical_questions_medical_school_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a87d31-cceb-4f5a-89ea-da09c878c222/how_to_change_name_on_nec_aspire_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0033d1-d1ad-4e1e-8e76-2cd3b2636142/nogenibifo.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_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 5848 bytes
SHA-256: b8162e941e23b964d4a9c03bd5a6ccd56fef29ec8066308cc8bff41c854911ce
font_01_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 10340 bytes
SHA-256: d7a663d96243454a8d689bbea7acc9c26d99520da7dbd087ce5838aaabae6f50

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