Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e95f740fc6aad6b…

MALICIOUS

PDF

107.6 KB Created: 2021-07-12 22:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f0b9b777a4f34fc5e83f804f314fbb4c SHA-1: f839f77acf8e3375cc73b597620f0de4e16ec14e SHA-256: 9e95f740fc6aad6b44eac384f46166317eeca6eb1f79bde8bf46ee772084cfd9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-severity heuristic indicating it is a lure for free downloads, redirecting to a phishing site via the URL https://laborke.ru/square?utm_term=can+you+wash+puffer+jackets. ClamAV also detected this file as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest a phishing attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7457

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://laborke.ru/square?utm_term=can+you+wash+puffer+jackets PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec831aad4a1a22a3e74c4a/1626112794567/pinoy_big_brother_otso_full_episodes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e88661526bc76d6b874164/1625851489660/99386948521.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e867254576b64e43b2618d/1625843493595/acre_feet_to_million_gallons.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94f5c3b7e7c633451a511/1625902940175/liviralelav.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e93aec2f3c4128e18b31b9/1625897709007/76566159094.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7885846a8e17713dfe0bb/1625786456665/gta_5_for_android_apk_obb.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_off0001415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415C 17828 bytes
SHA-256: 969c66d74251b996616a79f03dab1cbfbae53bb431a2a27eed1f42144128e352
font_01_sfnt_off000170b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000188d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188D0 10992 bytes
SHA-256: 16fc4f782ef2ead98d48f5dc252100d6704fb9b1cb08f614317eda7f988dd029

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