Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b84057e83eaec2…

MALICIOUS

PDF

76.0 KB Created: 2021-07-14 10:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7231b1ca1c2254988a1b1cb53035a7fc SHA-1: 5ac802eebc3d5a86fc2db2030d87d43741b6312d SHA-256: a3b84057e83eaec292f07edd8b280f2758185568d009e47e3e08d52160a3c51f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-severity heuristic firing indicating an image lure linking to an SEO redirector, specifically for 'free-download phishing'. The embedded URL, https://ketchas.ru/square?utm_term=twilight+full+movie+in+english+download, is the primary indicator of this malicious activity. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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://ketchas.ru/square?utm_term=twilight+full+movie+in+english+download PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ad294b0a8d5efe5adc3e/1625861417692/what_is_the_perfect_answer_for_why_should_i_hire_you.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e81de5d0799e4214c2f858/1625824741147/menarugibenufiwilisewew.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9332219a9f87deb736eb8/1625895714378/velugemorijisezenadebut.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee06c082b49873592e3cf1/1626212033101/puduxeduj.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7cde9d0799e4214bff4ff/1625804265160/70699145828.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee00448f209f4d828785b6/1626210372449/rariruluxikut.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_off0000c711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC711 10916 bytes
SHA-256: da0a3c84a59b521945b3fbe177834173e500fe986639dc90a769db943cc0979c
font_01_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 16716 bytes
SHA-256: 1b9eef9254c4dbe46fc8cc4c294bb3071629183f0465992e4c54662893261691

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