Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ecd585b11b9d5b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-16 09:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a5edc517d85bfe3df855b09a777a583 SHA-1: 956a2588d0003bf9bf9f94905d3fbd2217642110 SHA-256: 24ecd585b11b9d5b749c6ecef34a8673bad84e8511452a02ac6883fda5ef9a7c
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://seumenha.ru/strik?utm_term=love+%2526+respect+book+%2526+workbook+2+in+1 PDF link annotation
    • https://cdn.sqhk.co/zofizitene/jJVhglS/cartoon_wallpapers_for_android.pdfIn PDF document text
    • http://magnifioco.site/are_taco_bell_bean_burritos_good_for_youb1yl3.pdfIn PDF document text
    • https://cdn.sqhk.co/gekobegij/iijJghU/kapetopunerap.pdfIn PDF document text
    • http://jusefaw.22web.org/carnegie_learning_skills_practice_answers_algebra_2.pdfIn PDF document text
    • http://verifedform.com/behringer_xenyx_x2222usb_reviewpmwtp.pdfIn PDF document text
    • http://dokuloraxu.22web.org/6766993834.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/07ac0da3-1542-4b71-949f-3efc9374a6eb/gubageto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f85616-0a17-4a5e-a896-c5ab341969d3/71432283109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652f92ba-7fd6-4e7f-8434-287d7a22207a/what_are_the_3_key_points_of_cell_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e466e42-fe65-430c-8999-b507b7bedd6c/32454358932.pdfIn PDF document text
    • http://jibunizaduz.epizy.com/21902501987.pdfIn PDF document text
    • http://roromopenofo.epizy.com/78599627814.pdfIn PDF document text
    • http://noxewun.rf.gd/aphasie_de_conduction.pdfIn PDF document text
    • http://dimizisunope.epizy.com/multiplying_decimals_worksheets_grade_8.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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 4160 bytes
SHA-256: cc68b17ae5f366a1e8604419e4dea2775c9f9e5c573084efc57836ca752ba371
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 11016 bytes
SHA-256: 9546501c2db2abc096ac0340433ee62dddde0feb2d9f0fd3e6cb0b02d787fd10

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