Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb228e724a8f2709…

MALICIOUS

PDF

79.0 KB Created: 2021-07-16 20:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 89e8a985d55d9709ccad76fcadf898d7 SHA-1: 1424e4db4a342e44436430a0971a9325174fbadc SHA-256: cb228e724a8f2709220caaa3c4e12163b48940b0d9ce103f10b5b4d3ffeba598
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-severity heuristic indicating it is an SEO redirector link, disguised as a free download lure. The embedded URL points to a Google Feedproxy service, which in turn redirects to a Squarespace domain. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8890

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/qQn0o4eTdIQ/square?utm_term=cheerleader+mp3+download+free PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8bd3ba7bae82fe895d39b/1625865531168/normal_platelet_count_in_human_body.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f15440f75f957e35b8dcb7/1626428480662/story_of_icarus.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f131153d214e0c0781f058/1626419478147/saying_bull_in_a_china_shop.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edce7cba7c7f743c1b87b4/1626197628773/panoply_meaning_in_marathi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f17960b0b7347a5228a9b5/1626437984141/faster_than_light_ios.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e772e29213031c8d41f5f4/1625780962600/pelekof.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee1941115d504d3a837f60/1626216769765/one_eye_is_nearsighted_the_other_farsighted.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7f0ea8ad60325f0c73d68/1625813226173/easy_2d_drawing.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
stream_004_off0000ffff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFFF 16544 bytes
SHA-256: cca0f731eeb4d713341ba0d665983d33fdde7aab95a5f393b6e0b5f3c3ee9db4
font_00_sfnt_off0000bbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEF 16748 bytes
SHA-256: a9b500ecd952e13fb8d9075c744d116c918b7d9d69177778bc70dd3ac41ddfa7
font_01_sfnt_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 10696 bytes
SHA-256: 82d25da3e4219ad2e72443e37deb4fdf703faa71b8ec0cfed7dfd7030dd23931

Open this report in the interactive analyzer, or submit your own file for analysis.