Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f5e527df1502c0…

MALICIOUS

PDF

78.5 KB Created: 2021-07-12 20:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4c59a03dd7b99b956304823bca24431a SHA-1: 971292dcbe68aae85017dd0192d1e80fba35e9a2 SHA-256: d7f5e527df1502c0e38952cac4932f201f8ab78802e30b2ffb56c0a9aeb327aa
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains an external URI and an image lure designed for phishing, redirecting to a specific URL. Although no scripts were extracted, the PDF structure and the presence of a redirector URL strongly suggest a phishing attempt to lure users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8439

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/iCUEKX862tE/square?utm_term=most+fluent+english+speaking+country PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7980bdd82073f6fe048e/1626110336954/crossfire_series_book_4.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7a6f3a853d606aeb7754/1626110575839/2_player_golf_card_game.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7974700aa07a7893c621/1626110324412/zisevabala.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e85fb1f8c38436265600d8/1625841585921/muzadunagetanikaxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8b50a076e3e03a9e743ec/1625863434978/zoberadebikunisusile.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_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 17596 bytes
SHA-256: 3d39bdb3fb8e11deb6b60a33f3d6d2f5c9a1a12b7bf2ff8b5bb65d3bb36feec7
font_02_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 11060 bytes
SHA-256: 86987915c623e54b2073de539fc7ef0008075784cc4121cf3843d395af34bf35

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