Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f523830cda8e18…

MALICIOUS

PDF

87.5 KB Created: 2021-03-16 12:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7e913a934c43ac783586dcaa697335fb SHA-1: d96448cfb5b290df16010320f4fe0ec1fbb5e1b3 SHA-256: c8f523830cda8e18e82f2d2ea1f46f3851a6627ede8dd17aba28d1dd8e36cfb7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded links to disposable domains. The document body, though heavily obfuscated, suggests a lure related to downloading an English learning PDF, which is a common tactic for phishing or malware distribution. The presence of many links to low-reputation domains indicates a likely attempt to redirect users to malicious sites.

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://jacksth.ru/award?keyword=speak+business+english+like+an+american+pdf+free+download PDF link annotation
    • http://leree6.club/this_is_water_david_foster_wallace_annotationsvyuef.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/bergey_s_manual_of_systematic_bacteriology_volume_1_download.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/novoditi.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/japapupafidazetuf.pdfIn PDF document text
    • http://makeyourself.xyz/dagalorojojonnt4rn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475847/normal_600585e957a72.pdfIn PDF document text
    • http://shoppingyxplus.xyz/gobududejemuvumebunewru1f.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/degoxesudiranajunekilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_600a8e0cc6d18.pdfIn PDF document text
    • http://fajamad.mypressonline.com/what_year_is_spider_man_set_in.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/how_to_yoga_breathing_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/rrebicH/business_action_planner_notebook.pdfIn PDF document text
    • http://firstsecu-paypal.com/textbook_in_chineseispdo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5fc8865d0099b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_601edac432135.pdfIn PDF document text
    • http://alphabitx.com/paligapirekofinm09l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_600b6c29c1571.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/dowazevafumaderepegi.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/how_do_i_replace_my_verizon_fios_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoroxur/QpgeZyH/iihf_juniors_2020_stream.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubelifijam.atwebpages.com/25512509129.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/usmle_step_1_score_report_2019.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_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 5968 bytes
SHA-256: 3c6201e3348afab47eda16f01b2cd2cdced0fe081237b23058615f38057cb72b
font_01_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 11320 bytes
SHA-256: 90b837e31560b29c17bd981eee9e881c1472306c7ddfa4932a83e054e6b7cc4f

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