Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfb941594a12180…

MALICIOUS

PDF

78.6 KB Created: 2021-07-14 10:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4c2c6b00ef69e8b5cd334fee6be20122 SHA-1: cd09e57f5d5b1d959d973d5d4748d530651283a9 SHA-256: 9bfb941594a12180b64dcf29474106e0122773cc55ca52e8fc375ff567969fa8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-severity 'Image lure linking to an SEO redirector (free-download phishing)' and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs, while mostly benign, are part of a redirection chain that likely leads to a phishing page. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 5

  • 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.
  • 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/CHqDoFjlE84/square?utm_term=by+function+in+r PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7d4525eabb22f35da5c5b/1625805906195/wheat_production_in_world_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee82d7e03b615e0991e459/1626243799789/spare_me_the_details_meaning.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec835a40121f566899f491/1626112858832/bonoviko.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8fd6a320dbd0de27fbf42/1625881962427/82743639001.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8072181471576eaeeaadc/1625818913168/dragon_ball_z_tenkaichi_tag_team_ppsspp_download_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee6e9102e0767984f67a85/1626238609464/sutonarinekumakebi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e91193085b1c120f975797/1625887123643/science_class_9_notes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e798d552059f1ec1e0227d/1625790677230/watch_pitch_perfect_online_123movies.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edb24c3d37cd087e6e8b69/1626190412467/25745396674.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_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 15616 bytes
SHA-256: 6bed06e9b9204f698076b26682db97d70208be09ccc084e199cbd0fa47878864
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 10088 bytes
SHA-256: c36b1a8f42508aeb0bacb262c6e73848e3fdd7d455b9f432f926584da3cf80a6
font_02_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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