Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1a4afbe2a1f83d…

MALICIOUS

PDF

71.8 KB Created: 2021-07-12 23:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a7dc6821e9cb8f39f6487fbdd4b1131 SHA-1: 8264a27aef140fb1b6b99fe5bad513d1f939d77a SHA-256: cc1a4afbe2a1f83d99b32ed30a40c530dc96792932ae7f17bb74fc07f2938a80
136 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, using an image to redirect users to a URL. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were extracted, the presence of a redirector URL strongly suggests a phishing attempt, likely to trick users into downloading a malicious payload or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8363

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/J-SxIuB37Ms/square?utm_term=questions+on+html+with+answers PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e796b169e16759cf71eb81/1625790129306/how_to_get_gallade_in_pokemon_shield.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7d95cc9768212242194f/1626111381569/32921518755.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e796fda431ed42d2f7e9ee/1625790205147/opposite_of_corruption.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec76dedd2ac847ff7d4c8e/1626109662299/epitaphs_on_tombstones.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e923432dabf27235547288/1625891651911/rujutigel.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e923f0c22c005c9338c109/1625891824679/hack_for_subway_surfers.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_off0000b9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F7 15404 bytes
SHA-256: bf3d1459fee7cadacab4907ea86a2f225b2f1790e77604466e459f7e8ef28f58
font_01_sfnt_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10620 bytes
SHA-256: 9863140e7d1e5016919f5cd094eee1f6ea2e166048dee82df5361413ca63a83f

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