Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c1de84cddc7f82…

MALICIOUS

PDF

75.9 KB Created: 2021-04-06 01:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 072e162af4070bf5b9fefafb09a6fd12 SHA-1: ad0bad9eb813e51b61e5f4faecef0f33e03192d3 SHA-256: d4c1de84cddc7f82cab466f69590c03face1e243bc6ec26c274803e1b48e2cf9
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=stephen+king+book+releases PDF link annotation
    • http://fuxutigox.mypressonline.com/gutapuna.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/juzisiteridazuf.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/61440556204.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/fuxuwonivetabiraja.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/foreign_letter_of_credit_meaning.pdfIn PDF document text
    • http://funogager.22web.org/bootstrap_admin_template_vertical_menu.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/f2ef2387-7cec-4cda-b95c-9f3c309929ae/cambridge_igcse_chemistry_coursebook_third_edition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/rafaroxowipu.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/nololinokusonexab.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_11ff8685f6724b3d858fc7803ce7941d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a988ade2-febe-4dda-86fe-2808ef18db44/kyocera_printer_drivers_for_mac_10.10.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/korijiwavomizenup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e20df9b-14e9-429b-b9a1-e4ac33eef76f/dbt_therapy_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/nabamagokidifenajuwuxuguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4e534f-b4b8-45b9-9682-35751c61f982/acer_laptop_buy_india.pdfIn PDF document text
    • http://rulumagevamed.epizy.com/76430813314.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/sepsis_6_nhs_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/ripizumigelozupusiruzun.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/benny_dayal_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/best_forgotten_realm_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065d1a78-578b-4505-8a28-2ef1834bd74b/sobasabivawijiruwifepat.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_ddd885f39e3e4615aa9289f1e10f1941.pdf?index=trueIn 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_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 5388 bytes
SHA-256: f2cf541014b2e7b60a7f6b7407945263f0b10aa450806c3fb28c201ed2bef111
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 10536 bytes
SHA-256: 0b19f6e73cddb9017d8b3150495b42d2322ca29429836675d1fbcba39c05c785

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