Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fb6cb3af48421e…

MALICIOUS

PDF

80.6 KB Created: 2021-05-23 00:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9561ae07a3fe7c5711b1647a13120044 SHA-1: 9dcbc568882bb98f0284dd0c90b7bf5523b3cbeb SHA-256: b5fb6cb3af48421e5ecf09447131ded701d59f8a4d2cbe1b3866722ff30285d9
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 0.9991

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://nipisod.ru/strik?utm_term=wayne+gisslen+professional+cooking+7th+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392650/normal_600969a6e8975.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378152/normal_5fc854c6dc8b9.pdfIn PDF document text
    • https://kolabonedabisam.weebly.com/uploads/1/3/4/3/134398983/xiliv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_5fea274597459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5fd0eb463d493.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/pelas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5fe5072db9baf.pdfIn PDF document text
    • https://subogepaweb.weebly.com/uploads/1/3/2/3/132302814/xirejetosin.pdfIn PDF document text
    • https://wafebunutixiwi.weebly.com/uploads/1/3/4/1/134109037/4596474.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/ddd6afd3-83e3-4627-9e3e-e31bf41915ca/lelekimabijefonupafe.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/mobile_moped_repairs_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/comment_joindre_2_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998e1f83-fec5-413d-b4e7-19126d0a18f9/punctuation_paragraph_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/ramayana_story_book_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/fanfare_for_the_common_man_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87525593-dda6-48b1-875f-f3fe6f1ad129/how_to_replace_a_nixon_watch_band.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/assassin_s_creed_odyssey_fate_of_atlantis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78521df9-4ef5-4f49-b1bd-eb89549427b2/what_causes_scratch_marks_on_back.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/specifically_what_process_yields_the_co2_that_is_exhaled_during_breathing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282768db-7cdd-43dc-80d0-b31459eb7c1f/83251016403.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/honkai_impact_3_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/different_types_of_reports_in_communication_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/vistas_5th_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/fevufefavakutafajekivi.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_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 5676 bytes
SHA-256: ec738d3e3399443ab8d130dad762dc3a91b18dea3c1b6818975cadc82b622425
font_01_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 12168 bytes
SHA-256: 2df603e30d0ac162248bcf3343bd80973d6fa3269d184d41dc0cb02d314e5641

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