Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a9e3621d42376d…

MALICIOUS

PDF

79.5 KB Created: 2021-04-30 16:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ebea7975c575da68be3029c312e74071 SHA-1: 90c06a1902825c09ec49e57a0fc0ed74db9b2c57 SHA-256: e4a9e3621d42376d3b673c6287d3792ccfa7be21dd8d7bed50a4ca6ad66ab518
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 0.9996

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://baarspo.ru/strik?utm_term=monster+island+book+justin+richards PDF link annotation
    • http://zaxiluxedexu.getenjoyment.net/5690350834.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/idQheoz/download_stickman_counter_zombie_strike_1._6.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/h7idwfs/vakowezabefogawup.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/fZy2p4A/nasal_polyps_pictures_symptoms.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/ida_pingala_sushumna.pdfIn PDF document text
    • https://cdn.sqhk.co/rawatajizefu/cHa7iiv/wufomesimiveleg.pdfIn PDF document text
    • http://xufikefizot.sportsontheweb.net/b._p._ed_books_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/cIzkjgM/among_lock_ios_12_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_604302a55408f.pdfIn PDF document text
    • https://cdn.sqhk.co/lokojagivel/ccaghgj/60358243914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_601f1c3c5cdde.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/5ifNgc2/pulujovisezin.pdfIn PDF document text
    • https://cdn.sqhk.co/fokapalo/Fjihdgh/nick_carter_dancing_with_the_stars_everybody.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/MiaiaEj/9888487200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_5fd82b3c41e1e.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/jahhRhd/titan_quest_anniversary_edition_solo_class.pdfIn PDF document text
    • http://zetumitufam.mywebcommunity.org/molecular_mechanism_of_nitrogen_fixation.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/g3unOZa/how_to_make_blizzard_launcher_faster.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/77723094003.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/76085702879.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 5192 bytes
SHA-256: 4b0a6f423bd79203fcd4dfa417106e4fff3edda0085706bd42dc83fce662b7ad
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 10396 bytes
SHA-256: c9fec043507a0eb7856d3d71b7791065bb696deee7d9e52987c9322a3b7347a4
font_02_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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