Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc7529a87ba596d…

MALICIOUS

PDF

82.1 KB Created: 2021-03-23 07:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ce4a976e86eda22473ba59d4fc3d5490 SHA-1: 749cf191a6cbdc25b60409c274f1cb3226986f86 SHA-256: 3dc7529a87ba596db1e502b81a2b2668f332e3f783f4930e8c8680466b30d4c2
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-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://ponafet.ru/strik?utm_term=best+new+yorker+cartoons+instagram PDF link annotation
    • http://vir-tus.com/kathy_rain_ios_walkthrough5nzcx.pdfIn PDF document text
    • http://legendarycraft.ru/powerpoint_templates_free_2018_for_educationz7be5.pdfIn PDF document text
    • http://dom-bita.org/976984403499kai3.pdfIn PDF document text
    • http://goginexoze.22web.org/nikon_d40_instructions.pdfIn PDF document text
    • http://vir-tus.com/how_much_does_a_cfa_cost_uk379dy.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/mechanical_advantage_of_simple_machines7e9ch.pdfIn PDF document text
    • http://geosen.net/85540992855ga07l.pdfIn PDF document text
    • http://kataeta.club/30139378336xtpuv.pdfIn PDF document text
    • http://blankid.ru/ferodisalovaxepejzdv2v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_f0553fd15bfc4010af9e7e8ef65b7a7f.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_a9ef73afce3a4cf3821419b90e845a9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fd48dc-abbf-468a-bd47-52f3f3620328/how_do_i_apply_for_free_childcare_for_2_year_old.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_88a8305cc3644d28801423fc21f52150.pdf?index=trueIn PDF document text
    • http://xelinekevob.epizy.com/bhaskara_satakam_padyalu_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38855c5-7be0-4710-8524-6a38be05de77/belle_beauty_and_the_beast_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fb36bd-f4ab-46e0-96f0-0578235ab3a9/citizen_eco_drive_calendrier_diamond_worldtimer_mens_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232a300f-662e-490e-9da4-892cbc133327/bijujekekubivolopozififo.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_dca320199d7c43a5b501df3a8f5cf44c.pdf?index=trueIn PDF document text
    • http://ponuwisakaso.rf.gd/books_download_marathi.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_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 5392 bytes
SHA-256: 2a14d3d5faff9602416b72538bfd5dbfae79fd42c685f5410e73ad06057a5c9a
font_01_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 11356 bytes
SHA-256: 87afb6beb59fe94208f3dd64800b7deb4bfc3597c639fb57f81c759a5432178e

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