Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24579b83f2f7ae4…

MALICIOUS

PDF

71.6 KB Created: 2021-07-14 02:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8b32ae8a430f31edc83d2fe38f707de0 SHA-1: 7195c467ffd2fbd683863eafa5e1621e80a0a46d SHA-256: e24579b83f2f7ae4bbca0af3bbbdbb5a43464ef1e72997c131fa592757473c1e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a phishing lure, utilizing an SEO redirector to disguise the true destination. While no scripts were explicitly extracted, the presence of PDF-specific malicious indicators and embedded URLs suggests an attempt to trick the user into navigating to a potentially harmful site. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7342

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/hIkXU_AiHkM/square?utm_term=heritage+singers+never+give+up PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e841547facf136447e98b1/1625833813033/how_much_sugar_is_in_1_oz_of_vodka.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e80267dbb92d34f5b03eda/1625817703464/how_can_learning_difficulties_affect_a_childs_development.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c5a43e8238298accaa77/1625867684437/79214880183.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_off0000b990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 16404 bytes
SHA-256: 2e021b5bc9194347292e178e855eaf4c2787d920abcbf30d3fe9b4cac296252f
font_02_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 10420 bytes
SHA-256: ed0aa2e2ad6b3b3e7c0f109dda37a77ba8dc61ad9f13882c9467b962170cda07