Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36635b469ae9da3…

MALICIOUS

PDF

101.1 KB Created: 2021-07-12 22:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 54973447d643b7b2dfd0fdeec10e7014 SHA-1: 321c81ac2abc33c398e6cede2a5bafbc5ce6a051 SHA-256: f36635b469ae9da3cbf234c70f229b29426c96ec1a07d1cf1a5cd9c1fac45902
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan. Heuristics indicate the presence of an external URI and an SEO redirector link, suggesting a lure for free downloads. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards a phishing attempt designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5684

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/qQn0o4eTdIQ/square?utm_term=calculate+the+shear+force+and+bending+moment+at+point+b+for+the+following+beam+loading PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ef9a2c5c2f6215c6e488/1625878426733/numufimiki.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9147e2210ba6bce11a937/1625887870979/s_dsb_meaning.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8c7949ffc3426e8a4a035/1625868180170/matlab_for_embedded_systems.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7a0aed56f0f36126ddc36/1625792687011/one_piece_on_kissanime.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_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 11424 bytes
SHA-256: e198764e7077da4523ab387311d096535f2aa44bab8ccb6b648a702384ab1d64
font_01_sfnt_off00014086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14086 17016 bytes
SHA-256: 43fe7feb90e26f2dfdfb31ed30fd05df67138d7fa42f8aab465587226541b3ae
font_02_sfnt_off00016d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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