Malicious PDF — malware analysis report

Static analysis result for SHA-256 906a0e54ddf1c659…

MALICIOUS

PDF

122.8 KB Created: 2021-07-19 09:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 84a724397995d839381a9cc7beaa4bef SHA-1: 94b788e47992818fc01343340cd87fa7b2a1e436 SHA-256: 906a0e54ddf1c6590dd292d7597426258667e2f15188deb2692571bf16cb819e
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it uses an image lure to redirect to an external URL. The PDF document body is heavily obfuscated, but the presence of embedded URLs and the 'Urgency / deadline lure' heuristic suggest a phishing or malware delivery attempt. No scripts were extracted, but the PDF structure itself is likely exploited.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6890

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://feedproxy.google.com/~r/sq/ugae/~3/4aHNpQc2m6I/square?utm_term=1000+questions+for+couples+free+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edc1f8017ec663b5397873/1626194424490/46870101145.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec795c3f7a034ccb796bbe/1626110300616/what_is_a_adjacent_side.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f40583a9adb72803ad7bfc/1626604931978/6166296855.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7d03a1f8f93f64ab21ea/1626111236183/the_meccan_revelations_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f426a781f38b20588e867b/1626613416044/85495525031.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_off00017ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EC1 10776 bytes
SHA-256: 6bbc094240e9bcb8564e8658399636da5475fdc6db74d47ef83df1b5b3f2d8e9
font_01_sfnt_off00019776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001af88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF88 18244 bytes
SHA-256: 5aa31be4d20a1e87297aa8cd9ae0c5dbaf7b86a3b715cfa5d410bef159810aa9

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