Malicious PDF — malware analysis report

Static analysis result for SHA-256 805559dfb4a1c91b…

MALICIOUS

PDF

75.0 KB Created: 2021-07-12 20:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7684ff9ff00875ead00e42d05f6a7b7b SHA-1: 3140f8093a278dc423c174a20f9960423b8e21f0 SHA-256: 805559dfb4a1c91b66878d684053187a191c67ea3f094b067648f47b73be0c37
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic indicating it's a phishing lure, specifically designed to redirect users via an image link. The ML classifier also flagged it as malicious. Although no scripts were extracted, the presence of a redirector URL suggests an attempt to lead the user to a malicious site, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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/X6hrLWyzjlw/square?utm_term=pdf+to+html+link PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec79ba12c1416d2f19c7fe/1626110394048/90993196222.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7895bed7e6304395f2e98/1625786715849/god_hears_the_prayers_of_the_righteous.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e4e9fc46b1505824fe1d/1625875689313/the_dermatology_clinic.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b64d8592fe3a588fda0a/1625798221542/pokemon_rpgxp_games_for_android.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_off0000c85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85E 10148 bytes
SHA-256: 78b684b782ced1a506b77eed57a45d276727224094f7caae1f6eafbb1a6c86af
font_01_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 16152 bytes
SHA-256: c38682cec19bd200344810a621d84e110b16595c9b9436c3fe3610c3c799d04a
font_02_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1