Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0ac7c2c63d6437…

MALICIOUS

PDF

94.8 KB Created: 2021-04-11 20:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fdd48be9d4eddee81ede575ee3d44a62 SHA-1: a8fc63b552dd0913b653deb52d94b1a9866c71de SHA-256: bd0ac7c2c63d6437e3e4b5b3472bc06c0ed588b00abdfd01b1c4b950ddbd5841
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 0.9998

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://midufefew.ru/strik?utm_term=introduction+to+curves+in+computer+graphics+mcq PDF link annotation
    • https://cdn.sqhk.co/lakinidiku/ggJyEih/sufuxamosizokakoxuzaf.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/ihjjigv/new_york_city_guide_lonely_planet_travel_video.pdfIn PDF document text
    • http://pogetukexuk.66ghz.com/89908658807.pdfIn PDF document text
    • http://dalutufajako.22web.org/best_android_browser_app.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/zotijedop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_60314a8bcef3b.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/tonimijoj_wusalej_jitupiwotewus_dazopijesomigi.pdfIn PDF document text
    • http://parhelifrl.space/tilardxj0a.pdfIn PDF document text
    • http://agentsoft.space/85587946353y0sx1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489977/normal_5ff30a58aa3b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fc7c3d939b3e.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/vomisuxidite.pdfIn PDF document text
    • http://uaportal.site/53086028048awtx6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavasokunise.epizy.com/zululaputipawe.pdfIn PDF document text
    • http://melurijaniloxa.rf.gd/anandam_anandam_songs_masstamilan.pdfIn PDF document text
    • http://zaxukesaludu.epizy.com/lunch_invitation_template_for_colleagues.pdfIn PDF document text
    • http://zugodelojuj.epizy.com/badminton_court_dimensions_in_meters.pdfIn PDF document text
    • http://vekujekodabudu.epizy.com/huskers_martinez_injury_report.pdfIn PDF document text
    • http://bixibutudoj.rf.gd/13573946004.pdfIn PDF document text
    • http://deravamosu.rf.gd/crime_report_form_listening_test_1_answers.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_off00013724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 5576 bytes
SHA-256: 19e997ff08a6a122fa50780709a75416b08d44663ac1d3533e7b9f14080b050f
font_01_sfnt_off000149ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149ED 10472 bytes
SHA-256: 662ec8e0ac18a9674a45d7d82969f5e754405b43442cf106de4c4948c047c03b

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