Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f737d0f3a3d8628…

MALICIOUS

PDF

76.6 KB Created: 2021-03-28 17:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5315e7974265c5dd4a9be3df53deb351 SHA-1: dec019498ec62dbd7b5395ff350014a40268b428 SHA-256: 2f737d0f3a3d86281328994ac03dbe1f4015c88967c3e1cd868976ec38c46a31
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 0.9991

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://druttle.ru/123?utm_term=biochemistry+journal+pdf+2016 PDF link annotation
    • http://donbetosstreettacos.com/beckers_world_of_the_cell_free_downloadsvb0o.pdfIn PDF document text
    • http://znatural.space/sakupazepirupazodih3muz.pdfIn PDF document text
    • http://esparks.ru/who_qualifies_for_maternity_pay3wvmt.pdfIn PDF document text
    • http://thechambre.xyz/diary_of_a_drug_fiend_and_other_works7780u.pdfIn PDF document text
    • http://checkmycredit.info/adobe_media_encoder_cc_2014_crackdm0lw.pdfIn PDF document text
    • http://hookup153.site/barnett_vortex_compound_bow_19-45_lbugxo0.pdfIn PDF document text
    • http://nukicew.xyz/us_army_rangers_ww2_uniformmyqwv.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/amortization_schedule_calculator85roj.pdfIn PDF document text
    • http://ceter.xyz/lasko_5586_digital_ceramic_tower_heater_reviews86ism.pdfIn PDF document text
    • http://arthromedro.xyz/the_organic_chemistry_tutor_jg_facexc5mj.pdfIn PDF document text
    • http://zavodtriumf.com/what_causes_a_transmission_to_not_shift_gearssrbwd.pdfIn PDF document text
    • http://proita.fun/bumoxifufibasijukosabuwe1jq2.pdfIn PDF document text
    • http://flowerport.market/262519800313b6n5.pdfIn PDF document text
    • http://requiremcgood.com/82295098984jcng1.pdfIn PDF document text
    • http://fsbsiod.com/91269592358u2b5e.pdfIn PDF document text
    • http://detonic-de.website/corel_draw_portable_x7_gratis80mzl.pdfIn PDF document text
    • http://atomyimperial.ru/browser_for_mac_os_x3qzwz.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/zebowasepulanabefupudigewfk41.pdfIn PDF document text
    • http://salestore.pro/32808072014bwx6n.pdfIn PDF document text
    • http://fallofelin.online/tigemavinezakasazasoxudobiyu1k.pdfIn PDF document text
    • http://leomannapov.com/72467767714bvr8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdd6223-6343-4f78-8604-8c63e094a8a5/2822380138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3392f7-8d93-4b23-ae1d-4096b62a1ee8/is_the_invisible_man_2020_a_remake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a30f03-088e-448b-a478-ba61e8621f84/juzevulurivatefibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4078bc4f-2313-4ec5-82e1-97de088a75d1/how_long_does_it_take_for_a_seiko_solar_watch_to_charge.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 6104 bytes
SHA-256: 8c37e569a61828ef4b3153aca5dd70df975eaee4722c31bb99d9fe8f8a92c974
font_01_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 10904 bytes
SHA-256: baa936175a73f461c2ecdfc3d06f6f01f668b0adf8f27c49ad1216c35bc7839a

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