Malicious PDF — malware analysis report

Static analysis result for SHA-256 098a8fbcc591cc20…

MALICIOUS

PDF

83.9 KB Created: 2021-04-21 02:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8876a7a4dfedbefceba93eef39f77e6b SHA-1: 54e65304a7e36eff7505a3d2db46d50c92e0b8fc SHA-256: 098a8fbcc591cc20c8cf0a407d7c84d6a1f1715e12c61376ad66be38f3911d3f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=cooperative+federalism+canada+definition PDF link annotation
    • https://cdn.sqhk.co/wefekoferu/gdijrHD/35945343373.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/L9geij5/freemail_ukr_net_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465538/normal_5ffa38c6917f0.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/hikicyA/74018998048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_60547b8a8dc49.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/44zgfhj/21745547692.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/ferufewimopulogo.pdfIn PDF document text
    • http://gexuniganije.iblogger.org/bumblebee_transformers_car_timeline.pdfIn PDF document text
    • http://dozetekotod.22web.org/jovolixejirufopokasaxenod.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/jgBkjbx/bricks_ball_crusher_app_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_602e1b25d1a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_6025cefa319b6.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/pufidesaje.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/genetic_engineering_worksheet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_605947f26bf51.pdfIn PDF document text
    • http://pupigojoniru.mypressonline.com/biomecanica_de_la_articulacion_del_hombro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_60520e3d7e1c9.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/VmquMyw/tajejevevonugifajitideme.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/gdgigha/calendar_2020-_21_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_600049e11ac1e.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://rolodumom.epizy.com/dixuruxarabonu.pdfIn PDF document text
    • https://doi.org/10.21991/C9X68FIn 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_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 5172 bytes
SHA-256: 8fb9b1ddd0bf7c9f4d0170ac17d01407d3457e8cb2d8d2d7dc72968d4b5251c7
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 10824 bytes
SHA-256: 43b0a484d18f353410b005280abc05e7aaaf51c093b222eec9d71c7c9e76eed5
font_02_sfnt_off0001340d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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