Malicious PDF — malware analysis report

Static analysis result for SHA-256 276fa120231e204e…

MALICIOUS

PDF

78.5 KB Created: 2021-07-20 07:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 692c782d226bc30cf4e898e662da2477 SHA-1: 85829adba4982f4d3efdba63dcbebef9b850183d SHA-256: 276fa120231e204efeba0b69509c08a6bd8c573c1afc9e534be71a8e0dee3230
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a high-severity heuristic identified an image lure linking to an SEO redirector. The embedded URL, while marked as confirmed benign, was part of a pattern indicative of phishing or malware delivery. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/~3/0YvHz_IItD0/square?utm_term=cephalexin+for+throat+infection PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e84b3284a485174d874b26/1625836338224/6x6_crafting_table_minecraft.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1865fb3a282695d37339a/1626441311692/16613501392.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f233b122c2eb2072124050/1626485681324/types_of_koi_fish_and_meanings.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edb81f7c55557fb27f9c9a/1626191903605/tebigikovapolodivixikire.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_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 16608 bytes
SHA-256: 8887371e4bd70463a967375036b91028ca1551950d0882f8ef9846458e299d50
font_02_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 10544 bytes
SHA-256: 643ba6c6c3b337deb0be02f4cf4cb76b43931255129e5b2e4188d4df5d2a9e9c

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