Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5d9cbee6a09874…

MALICIOUS

PDF

77.2 KB Created: 2021-07-13 18:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 078c131887ca24c17f39929abda16404 SHA-1: 371e5e4e11e7c316dace028edc3b32e63f4345c1 SHA-256: 1a5d9cbee6a09874f45b169076595e8e27c2a50d9ee80a373961ff7181efe02f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic firing indicating it's a lure for free downloads, redirecting to an SEO redirector. The embedded URL 'https://inwebjor.ru/square?utm_term=loss+of+smell+good+sign' is identified as a phishing attempt. While no scripts were explicitly extracted, the nature of the PDF and the detected redirector strongly suggest a phishing attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7691

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=loss+of+smell+good+sign PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8df29fc46b15058248e7e/1625874217276/when_i_sixty_four_beatles.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec78c2fd54eb070824ae11/1626110146654/71036140682.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e93ce1566ded7d61ad9b07/1625898209213/digital_electronics_mcq_questions_with_answers.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_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 16688 bytes
SHA-256: 6541b00192cb1ca54f3891da701657fbf182427089c931ac812400802b7b0b42
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 10292 bytes
SHA-256: 56333ebb8789a47343964c8a3e53f4002cf803cef9e563cecdc86a1d6ee18c52
font_02_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1