Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d9e1226195276b…

MALICIOUS

PDF

96.0 KB Created: 2021-07-15 19:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 70cd3c60018dbeb10a2a20dac3328c0b SHA-1: 202e95459ff624821aa1f3cf4df9ec5cbd18b40d SHA-256: 28d9e1226195276bd07abe26a90620505db5805707801f182378ce25a22844b1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it functions as an SEO redirector for phishing. The embedded URL, https://inwebjor.ru/square?utm_term=expresate+spanish+1+answers, is the primary indicator of this malicious redirection. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/square?utm_term=expresate+spanish+1+answers PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7847de8c3264fe5db995/1626110023398/semispinalis_thoracis_origin_and_insertion.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee52fa64675e3b9de2c1b3/1626231546631/wavestown_and_the_electromagnetic_spectrum_assignment.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f01f0be4fb0f110d7cff20/1626349323998/47091347326.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e85b99857426732ba18080/1625840537739/72020517293.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7d4825eabb22f35da5d09/1625805954443/how_do_you_put_a_name_tag_on_an_animal_in_minecraft.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec701620781e4bb119eee7/1626107926975/43753746065.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edbb0490fd6f6bf7a2501e/1626192644354/duwaxute.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8eed1e370ac632286b1fd/1625878225569/jopusavotuwisu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94fd32dabf2723555cdd7/1625903059868/vatixe.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8b49e3af9106dcce24b61/1625863327030/7000_dollars_in_pounds.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e946d11448b0619849956b/1625900754049/how_many_calories_in_1_ounce_vodka.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee7e5777e2cd4113f38832/1626242648064/42410828710.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e898058e6e246adebd9978/1625856005479/pub_quiz_questions_and_answers_australia.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_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 19316 bytes
SHA-256: 3e7a5f2a6640ecbc3c507094793771e9408f23a39d61134229e9e4087bc31d4d
font_01_sfnt_off00014417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2E 10404 bytes
SHA-256: 655af91220672237c385b11ea1e9940ba7040e23cbbf83de9aa9dfc7fe1153fe

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