Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a06969f40cf7c8…

MALICIOUS

PDF

79.2 KB Created: 2021-07-12 21:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6e3e658f7e4c97302247a51f9b86810c SHA-1: 6776b8af1fea63cb5ca6b24c991b2b30ac5f2a4f SHA-256: 73a06969f40cf7c8451b5ed9409d7fa16ec742f3287a07a9a63a722b703cd34f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic indicating an image lure linking to an SEO redirector, identified as a free-download phishing attempt. The ML classifier and ClamAV also flagged the file as malicious. The primary IOC is the redirector URL, which is likely used to host a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8187

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://garglob.ru/square?utm_term=periodic+table+group+iv PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec71a912c1416d2f18d9e5/1626108329610/deadpool_2_coloring_pages.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e790f61873c46ac9351719/1625788662982/paradise_point_barbados.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c2293e172817b39c2ed8/1625866793168/marriage_anniversary_wishes_with_name_and_photo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8bcb561416537893fa47a/1625865397307/readers_and_writers_notebook.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e80c3c38ed220952af95a6/1625820220114/jizowusamepel.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f3e4bab0621613396060/1625813988616/94307628400.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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 10724 bytes
SHA-256: 582bc7cc5e5f0cae713918b65164b4bc16ea2599b0b4bf255c08e873339db711
font_02_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 16448 bytes
SHA-256: c0a5aeb9e1776ef86954bfbf57562215073547804cbcbf9417d216d59badb79c

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