Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4da05742959a66…

MALICIOUS

PDF

82.5 KB Created: 2021-07-12 22:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 360784f659dd08c2b61119b489e3c336 SHA-1: 9b07b41cce06b8b5585fe309590df2a1b739d4ad SHA-256: 9f4da05742959a66d42e84b9d75b1cf92e79747eed1fc8cb82fa98bc1d7e5ee9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that employs an image lure and an SEO redirector, as indicated by the PDF_SEO_UTM_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. Although no scripts were directly extracted, the overall pattern points to a phishing lure designed to lead users to a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9831

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/~3/0YvHz_IItD0/square?utm_term=factorise+the+following+by+splitting+the+middle+term PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e80b7c9ebc0053f3186705/1625820029050/loruwunokifim.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c9721b22c82f862d6ede/1625868658632/41000284373.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8fa9bf229ba2ea8358530/1625881243185/the_framing_of_the_us_constitution_word_search_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e92649f492d21a0f6b1262/1625892425482/s_and_s_wholesale.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e91344787dde1a90ad8c37/1625887556646/realize_my_potential.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e835afbab06216133c0d73/1625830831062/dishonored_2_artist.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7a02ff9c8b53cea16edd/1626110466649/4986252599.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec834e3f7a034ccb7a9adf/1626112847074/double_smith_chart.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93ccae51f1f218d6ae073/1625898186312/silent_hill_games_ranked.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA54 11384 bytes
SHA-256: e2051de01941924774ca7a8b20da807b81b3ca952a4691354e61bd8a8f3f3fa7
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 16588 bytes
SHA-256: ec8b8d0bc8f4a24775c5b60f67729937ef8242f93bcca7a714d410a3df41b27e
font_03_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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