Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea5b76c8cfe7582…

MALICIOUS

PDF

68.1 KB Created: 2021-05-06 23:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d7e32081f1fff7353ebd84e21a3fab2c SHA-1: 84a8a9ab4bcfa5ecc277ec90ced9b139692f9d88 SHA-256: 6ea5b76c8cfe7582d244fc89ebeb7960e90d5e5ca2f480b4f9311d4380550b60
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://golowaki.ru/strik?utm_term=wrat+4+administration PDF link annotation
    • http://dehydratedoriginalgoodness.com/which_country_gives_the_most_aid_to_africa9l2wt.pdfIn PDF document text
    • http://boviriso.22web.org/tadokiputenirefafivet.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/wAagfQX/survival_kit_food_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/jQqhbhi/19949435906.pdfIn PDF document text
    • http://vipmanmarket.space/how_can_you_transfer_vhs_tapes_to_dvdz55f6.pdfIn PDF document text
    • http://excschool.ru/pajoravopudua2fgn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_603c23c62f67b.pdfIn PDF document text
    • http://seamanygau.best/cosmos_carl_sagan_audiobook_downloadyxo4j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488314/normal_6046f10085f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_603ba2be94dcf.pdfIn PDF document text
    • http://fosikukiwa.iblogger.org/pronoun_practice_grade_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_db8167b5a214488bb5a201a6d848f6f2.pdf?index=trueIn PDF document text
    • http://kozifina.epizy.com/algebra_1_textbook_holt.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_6adb3258f2b543078458c0d53c249fc3.pdf?index=trueIn PDF document text
    • http://xupuwineris.epizy.com/vorupuj.pdfIn PDF document text
    • http://gojoxefesubir.epizy.com/easy_disney_piano_sheet_music.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_5187e8ac17c64bd39853633aff650df1.pdf?index=trueIn PDF document text
    • http://kejoluxukoso.rf.gd/smith_corona_typewriter_not_working.pdfIn PDF document text
    • http://vibibedoxoxi.epizy.com/zifusesimikup.pdfIn PDF document text
    • http://dijimati.rf.gd/44610403860.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_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 5040 bytes
SHA-256: e3061ea156292c8115b0513745a5c1d33ea458c5220c216353168c483c168b89
font_01_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 10316 bytes
SHA-256: f9dc4e81f62f4873122c9b17a9766fb70e23cb93fd6fc8a2d133830af6ae151c

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