Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3a0d0101e5a9a5…

MALICIOUS

PDF

75.2 KB Created: 2021-07-15 21:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 69473d96fc5e361456b02f4cebdd978f SHA-1: 4c84fd162f93c3ae85ee7d0e1bdbec279ef992e7 SHA-256: cd3a0d0101e5a9a54c550900bafb15e8ab790cc210b4851bb15690cc6ff30183
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and exhibits characteristics of a phishing lure. The presence of a redirector link, identified by the PDF_SEO_UTM_REDIRECTOR_LINK heuristic, suggests an attempt to direct users to a malicious site. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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://feedproxy.google.com/~r/sq/ugae/~3/CcIy6vlvkUk/square?utm_term=what+is+the+meaning+of+transmission PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9633faa30721e65f0ed16/1625908031513/47952622913.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca4633080d76c7a53fcca/1626121315206/wekigolunenutadetexuzid.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e79b259bae382bbabb9b53/1625791269426/being_righteous_means.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7ca9c25441e1b37853576/1625803420597/wusuxubigerumeganafebabuf.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_off0000c797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC797 10608 bytes
SHA-256: 768f9bb9fd001752748a8ed651f7bc5edc4d5f6dff85f9985b6ca2fcd2a9bad1
font_01_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 16076 bytes
SHA-256: 26220aa5234b7e9a70d139e8da9d21d9b46bbddd82b4d2b1de00fcf94ff4b981