Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bd7f3c99bf7d4a…

MALICIOUS

PDF

65.1 KB Created: 2021-02-07 02:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 63d1ea21cfc6f93638954ba48da8de73 SHA-1: 917cbbcf3f91576370f9bbcd8ee221f37a4ae930 SHA-256: 31bd7f3c99bf7d4a3fbae317706b87c1d58e0cff1326ad8577cc16ec98380671
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/wb?keyword=worksheet%20for%20countable%20and%20uncountable%20nouns%20pdf PDF link annotation
    • https://cdn.sqhk.co/vebiziwob/5Kiefja/throwback_to_office_days_caption.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/3676228.pdfIn PDF document text
    • http://vorecan.fun/complexometric_titration_experiment_reportv9qtp.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/c2aJFjQ/zojagipabunuxagawesijut.pdfIn PDF document text
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/efb69bf.pdfIn PDF document text
    • https://pufemomanuxisi.weebly.com/uploads/1/3/4/3/134344256/donunifekirupob.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/xakimojedef.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/vopipekijuwisu.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/5019484.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/tonemakopinibem/ajay_devgan_song_dj.pdfIn PDF document text
    • http://sewekovekejir.epizy.com/32993674530.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/reporting_bartlett_s_test_of_sphericity_apa.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/guild_wars_2_mesmer_pvp_guide.pdfIn PDF document text
    • http://familule.epizy.com/bufferedoutputstream_buffer_size_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/dazapemidebulogozonireb.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_off0000c263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC263 5460 bytes
SHA-256: 678cb2c3a16fd1a26eab5534adfdc1563ebf53be09e6e034f0c7c77634dda32c
font_01_sfnt_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 10132 bytes
SHA-256: 8c8ab7748bb5243aabc8535d8c8df8fb3d7bcf6f2dbe6e32c81b4900322fa5eb