Malicious PDF — malware analysis report

Static analysis result for SHA-256 b786b51405b0710c…

MALICIOUS

PDF

71.7 KB Created: 2021-02-16 05:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 38034e02fe87722fe40bcf1d6ba33446 SHA-1: 0d245b086baf6c5822754f5a719cddd9e999990c SHA-256: b786b51405b0710cba8c360b6390ab584d90763776bcbe2dfb730639495c6046
276 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/wb?keyword=how%20to%20install%20john%20the%20ripper%20jumbo%20on%20ubuntu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476123/normal_5feb07d1bf125.pdfIn PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/duserelikida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5feb7f939b476.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/jhCjegi/bojitusalelev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5ffe95d08602e.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/hdgchiw/48922938547.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hbTb7gd/98618084056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_600a8845d1aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_600e65ffc1034.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/nattamai_tamil_movie_audio_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/4gfibif/hocus_pocus_characters_in_real_life.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5fc8a9be4fda0.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/pulujolatepuv/rasopir.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/zalofebemuzokopodalivuz.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/plural_or_possessive_noun_worksheet_answers.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_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 5328 bytes
SHA-256: c97017a420f7a1cff2d3a2a2aa02222448ab781b9c2e10f5fbdf1f9b01a461e4
font_01_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 11568 bytes
SHA-256: 0beef22852f7ddcbccb42ebb730bc7edfd7d54a61d8f2d252a3d795db2f04dea

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