Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5179445ad816f6…

MALICIOUS

PDF

72.6 KB Created: 2021-02-27 22:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d9030c788aa83c624ba34b17fd6b725e SHA-1: 3c352b94487b01c31ef14aef85a2d6fa35e68c92 SHA-256: 4f5179445ad816f6a72437e72fd86b981c2aa3d18a75b574b1e9186971d1079a
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=select+the+false+statement+from+below+is+909 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428083/normal_60122abb1a643.pdfIn PDF document text
    • https://rezibufebaxiban.weebly.com/uploads/1/3/2/6/132695258/maluzupola-kukilikofanomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_6038e34c928fc.pdfIn PDF document text
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/sixebizonawaposun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_602d80205e260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_6033a7311a46e.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/04eba292e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_603723a0d46bf.pdfIn PDF document text
    • https://judesofuvedal.weebly.com/uploads/1/3/1/8/131857090/7813926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_601f90cd39ea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_601460d252d02.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/tolivajupeku/32737657305.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/70066226014.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/43367685189.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/lirik_lagu_bendera_coklat.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/bootstrap_3_search_form_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 3568 bytes
SHA-256: a51ddc4d69f95b8ab5fa1fc08a200d353141b84fabf8bdfe30aa55e77404d7aa
font_01_sfnt_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 5756 bytes
SHA-256: d3ed4a5d7958b18c917d76b34d4c0de47eccc67776b62e1a2c63b357252b9994
font_02_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 10312 bytes
SHA-256: 684825f56c29aaf1b56fd49817f5735249b08f458210abeff25ec6e9e2a6a873

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