Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c0b88e2cd31c72…

MALICIOUS

PDF

81.8 KB Created: 2021-03-16 07:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 38f0444784d4c277dafe4f24b5eb4bed SHA-1: 9bcd3d568847fdf5f14cac0ef3050da0e38f4c76 SHA-256: 18c0b88e2cd31c72b24af7f7a37b35bc0af5feb7c6c03b3af299131ce20a3b6d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=epson+xp+200+printer+driver PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392854/normal_5fe15ba78f108.pdfIn PDF document text
    • http://konufij.22web.org/pabopimekakewolajegudutin.pdfIn PDF document text
    • http://herss.space/snapchat_indir_kaydolfyadj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412154/normal_600816fec8fa8.pdfIn PDF document text
    • http://tujasumetozuku.22web.org/gudozamalisog.pdfIn PDF document text
    • http://podipotekoi.ru/metode_penelitian_pretest-posttest_control_group_designlvciz.pdfIn PDF document text
    • http://xokodiraki.22web.org/professional_development_plan_for_nurses_sample.pdfIn PDF document text
    • http://m-laskin.ru/what_is_the_meaning_of_logical_thinkingg6fdy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_5fdacaabb3443.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/petekesesogunopuxudo.pdfIn PDF document text
    • http://mandarin-fruit.space/how_to_identify_inferential_statisticsgyue2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/10129821894.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/reading_comprehension_worksheets_grade_5.pdfIn PDF document text
    • http://tewamenuve.rf.gd/8504327216.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_2679301199724579aeb7f061e4cf1631.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_762c51fa49c24cbb9cc7e5d48f0409be.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_652b02648b6f4ac49248b525f203fbb9.pdf?index=trueIn PDF document text
    • http://refewebol.epizy.com/assassin_s_creed_unity_trailer_song.pdfIn PDF document text
    • http://pifajipap.rf.gd/in_order_the_three-step_process_of_using_a_file_in_a_c_program_involves.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/is_biomedical_engineering_a_good_career_in_canada.pdfIn PDF document text
    • http://kusilip.epizy.com/37992449519.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_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 5072 bytes
SHA-256: 298bb1f122c8322696570423ac05dbece5671bdfc87732f1adc635df4778955a
font_01_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 10960 bytes
SHA-256: ba6bcbe8f51bc0d2d421705a83190dce14e2434605c510f6c8161ea12f7d91eb

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