Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adcb6ab74951b4f…

MALICIOUS

PDF

83.1 KB Created: 2021-03-19 15:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b3954c7d397510f3d82263f4102e2bf SHA-1: 3f3c9cd16024ef5ece921537f9882c279608fec5 SHA-256: 3adcb6ab74951b4f6906d22405e8d817c7e354d1d850849cb7990f1ee2fbf888
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://soxebez.ru/123?utm_term=aao+aao+bhikshu+swami+song PDF link annotation
    • http://dsv-trening.ru/best_norse_mythology_fiction_books280ro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_5fe89aad98b09.pdfIn PDF document text
    • http://coolvdomaion.online/bases_nitrogenadas_adnvhu0d.pdfIn PDF document text
    • http://noverst.xyz/pipokewisdiz9.pdfIn PDF document text
    • http://smartline58.ru/596193255498cjgt.pdfIn PDF document text
    • http://it50save.info/asterix_deutsch_downloadvs3iv.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/to_ride_a_silver_broomstick_by_silver_ravenwolfv1rqv.pdfIn PDF document text
    • http://ledimpress.biz/38543996987ldt5l.pdfIn PDF document text
    • http://hookup753.fun/nivuxututezeoac84.pdfIn PDF document text
    • http://vengriya.space/ralunuwosukomutubobup0fb.pdfIn PDF document text
    • http://yesnutural.space/clinical_practice_guidelines_diabetes_type_2dkw49.pdfIn PDF document text
    • http://badge-verification-center.com/us_navy_atlantic_fleet_ships8hinm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402507/normal_5fec79c58e06e.pdfIn PDF document text
    • http://copyright-infringement.business/how_many_blocks_away_do_mobs_spawn93qeq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/falevi/passport_form_ds-_11_post_office.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_6d5833408fad4bb087e2b42eecf4b542.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_4dcd6c56bd1d416e8804cb9917ff31f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesijesule/jepepixenimuwugufikifedox.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/40529313295.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_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 5256 bytes
SHA-256: 32354fad3012fcd678f91b50ce24e5c1d79eec4ba6d532d5b41210182b447cb5
font_01_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 10780 bytes
SHA-256: 9f3c0d290047055941e484377472f7c60108e66d239f1d91b0a236d6c7324633

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