Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e99da5e498ac68…

MALICIOUS

PDF

82.9 KB Created: 2021-02-04 17:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 98a646e27a18bf04c948879f1b180d91 SHA-1: e68cbf69c116b9954e64e2b338daee088e32341e SHA-256: 81e99da5e498ac68492566518b934ee6367e8df9a8c081520637b2c941faa8d9
136 Risk Score

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=crash%20course%20world%20history%207%20worksheet%20answers PDF link annotation
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/4008008.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/pfGjcko/tizebona.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/jFHAhii/puwuxifenawafunaligovar.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/icJljaD/zepovorufitorezoxutez.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/ijg2gfO/ruwenogazimatavepabi.pdfIn PDF document text
    • https://cdn.sqhk.co/zawukomofise/kjiagdx/72621477639.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/xjbnqgi/spinner._io_juego_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/iiU1rii/42513812100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://belunovozexuse.rf.gd/56922303669.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/radakedolu.pdfIn PDF document text
    • http://lobivovakebala.epizy.com/dinafem_cheese_smoke_report.pdfIn PDF document text
    • http://valamujunitun.epizy.com/ebook_reader_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/upstream_student_s_workbook_c1_answers.pdfIn PDF document text
    • http://fiwujugisijema.epizy.com/79._chemical_symbol_parade_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/98950034273.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_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 5272 bytes
SHA-256: 0f9b40f63aab9853e00761b8017280e693bb5b0f15dd3736360fb8dd921c6d14
font_01_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 11568 bytes
SHA-256: 588afd5639706d7e8c6d319a89dfa1e68a474f8c08ae4cb947622a19698b4533