Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a4738b14ebdbf9…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 06:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 080f61f78166e257a349428e9e0dd45c SHA-1: 95966f7d5f0c0b23dcbdce7e113930860c2fa30c SHA-256: 86a4738b14ebdbf9f9b918101840a2a0882e6aa60efa0fdcf2e2125245b1be90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/wix?keyword=social+constructivists+theory PDF link annotation
    • http://lemakomude.sportsontheweb.net/dave_chappelle_cant_stop_wont_stop_gif.pdfIn PDF document text
    • http://nilanudid.iblogger.org/message_loud_pro_apk.pdfIn PDF document text
    • http://mysteps.online/online_multiplayer_games_android_like_ludop9fbc.pdfIn PDF document text
    • http://tixshopclub.fun/grade_4_math_addition_worksheetsddd1o.pdfIn PDF document text
    • http://graatorama.fun/fowariwelugfehy.pdfIn PDF document text
    • https://cdn.sqhk.co/pibutuvopedu/6m7R1QP/gaming_wallpaper_hd_for_fbrs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5fcb6eed5f8c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426941/normal_5ff29f5e0150e.pdfIn PDF document text
    • http://fruktovik.com/danovujewafovqs4o8.pdfIn PDF document text
    • http://myyshooop224.site/85074017446xv8yj.pdfIn PDF document text
    • http://topafigo.mypressonline.com/52255635873.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/ELWwSgi/mermaid_secrets_of_the_deep_5.pdfIn PDF document text
    • http://nesobaka3.xyz/vizio_sound_bar_connect_to_lg_tvx5l0j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_60235e7dd2c99.pdfIn PDF document text
    • http://tojenan.iblogger.org/72643180924.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/iahghap/voxuvane.pdfIn PDF document text
    • http://webcam-model.online/adobe_photoshop_7._0_apk_freen9szc.pdfIn PDF document text
    • http://cupe1.ru/juditamukafosawukiryo4zf.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ifjdhdr/71868296865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ninesunugata.epizy.com/shaandaar_songs_free.pdfIn PDF document text
    • http://rebipilu.epizy.com/insecure_love_quotes_images.pdfIn PDF document text
    • http://wigexoli.rf.gd/ramadubesu.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_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 5152 bytes
SHA-256: e2eb35051b9d6f873db7d7d062682152cf6042284d24143a870253aa18e28122
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10360 bytes
SHA-256: 2463d63559a5bf07fff0301be6eeebac6a0fb7c05d52ac3e8debaede0575b4d6

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