Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f486dc16c2f3962…

MALICIOUS

PDF

70.1 KB Created: 2021-02-15 17:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 105ab6f366912f99098f460e51563d25 SHA-1: a9ed7173526cd75de9ca5cebb60c23dc27fd802e SHA-256: 4f486dc16c2f3962517b211b63bbe849bf61e165a5bfa4ac973b88e79185adc5
202 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=precalculus+vectors+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_5fd2d251c2884.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/pabegspckp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_60274f4cdb70b.pdfIn PDF document text
    • http://front-glass.website/sonic_drink_sizes_in_ouncesnv9qi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5ffd6f4ea51b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fe962403b253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_60053b662050c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6018b5f67918b.pdfIn PDF document text
    • http://lidagejelotodu.22web.org/ncert_maths_class_11_in_english.pdfIn PDF document text
    • http://daating19.site/8102558mpblf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_5ffe4e2d66e6f.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/jofunozuzof/cumulative_distribution_function_of_discrete_uniform_distribution.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/material_safety_data_sheet_short_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/nuzebulesurepimewiwilepus.pdfIn PDF document text
    • http://vilaxetewutino.epizy.com/xuzisukopixegukudi.pdfIn PDF document text
    • http://josekew.epizy.com/zuximiputefunulaj.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/57612735261.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/gonaporome.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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 5104 bytes
SHA-256: d4f73e57f33ba06ce12a2ccc1859dc8449dddaa3809b10b1c015bd3a1c97e7d7
font_01_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10400 bytes
SHA-256: 87867a6e7ad9a27b1d1d0ccf50fe4560510d907160e1b40200c33b2400cb6798

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