Malicious PDF — malware analysis report

Static analysis result for SHA-256 97eedc8caa48d956…

MALICIOUS

PDF

239.8 KB Created: 2021-07-13 00:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5acbc40108a9ece347d9bdb5827caa29 SHA-1: d0e957c1950b15ff33809a9f018113ae9383f318 SHA-256: 97eedc8caa48d956ddfac96e644804983cd10cba98530ff3000f813c06b1b295
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate the presence of an external URI and an SEO redirector link, suggesting a phishing lure for free downloads. While no scripts were extracted, the PDF structure and the identified redirector URL point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3308

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/-MXWpcYQ7kA/square?utm_term=science+measurement+and+uncertainty+accuracy+and+precision+answer+key PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8efa973f9128ac6baf50/1626115834647/wikagibonopibakurolu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecb38f45c1203003618c2e/1626125199104/college_sophomore_meaning.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c69ba7bae82fe89680c0/1625867931926/100_most_deadly_things_on_the_planet.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_off00034b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34B1A 11096 bytes
SHA-256: 5c527cf7ed2dec9569eeb023cf82a5a17694554d64ca8581c43840890b48d791
font_01_sfnt_off0003650e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3650E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00037d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37D20 20628 bytes
SHA-256: fa7a2d9311329074b50e3aa174e73169c960e2fa1912bf59964199f567e45e4a