Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4ee480290cd01d…

MALICIOUS

PDF

77.5 KB Created: 2021-07-17 05:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ecaaf8ea46b7d9502df3b247b4d32be0 SHA-1: 4e49b9ba0459cd97d94f695be7b905bc215077c8 SHA-256: fe4ee480290cd01deb972d2ce0ee30b65cb905e514333336262e2f62286b9639
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically points to an image lure linking to a redirector, likely for phishing purposes. No scripts were extracted, but the presence of external URIs suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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/CHqDoFjlE84/square?utm_term=how+to+get+my+peace+lily+to+flower PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f088c575b80b2ea8f10072/1626376390064/authorization_letter_to_get_psa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edd29ee55429721e1fbbab/1626198686920/67709747914.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f1a7f525a4974f363152f7/1626449909529/dizugemorudadumukem.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f057e4fb04a932b0d12520/1626363876825/gofowagesorokeromozene.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_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 10740 bytes
SHA-256: 3b55366aa837c4c40a7831ec21f452a2570b59b32dc0a1fca53e447b67616acb
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 16236 bytes
SHA-256: f0de045943407f21ad413f6c870e87aa718403aeb56eb9437ebc134437eb57ed
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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