Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc4eeab3c0ea8bf…

MALICIOUS

PDF

86.8 KB Created: 2021-07-13 23:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 69a4f7f83a493f17f44d9cb52ba72d21 SHA-1: 47cf0f7e9669cec9caeae5f8b2d1b3e84b833d99 SHA-256: fdc4eeab3c0ea8bf2ae28addd5e522cf5123dd162424e31089915ee937d5a636
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic indicating it's a phishing lure that redirects to an external URL. The ML classifier and ClamAV also flagged this PDF as malicious. The embedded URL, 'https://queure.ru/square?utm_term=best+soup+and+salad+combo', is the primary indicator of compromise, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9606

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
  • 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://queure.ru/square?utm_term=best+soup+and+salad+combo PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7e0b19a16f038d61bee8/1626111499822/69150906892.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8243a5c1b84600341aedf/1625826362744/past_tence_of_bring.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e91a7b37da2614570de45a/1625889403395/vubofabivudorizonilaji.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f4635ebba154a8fa2877/1625879652356/spoilt_rotten_meaning.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec79957726b430b46722c3/1626110357597/bed_bugs_during_the_day.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8c4351a87c5d75ac604d/1626115139994/c_program_to_reverse_a_string_using_function.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eda6bc50566b3f8666d9f7/1626187452615/80387318667.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed2c4e0124a666ff412d7b/1626156110411/kellen_name_meaning.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 16720 bytes
SHA-256: 08a3c6c3850ad538988dbe5672cf80e8691f26b82012712771d7fd4471dfdc9f
font_01_sfnt_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 10776 bytes
SHA-256: 7fc3a8414b4667b239bccc900297331e9253e3cc16f43861d09f40b23105e2f3

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