Malicious PDF — malware analysis report

Static analysis result for SHA-256 8543934d723faa44…

MALICIOUS

PDF

112.3 KB Created: 2021-07-12 21:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e967f35b324834904bc2d034e711afec SHA-1: b16171b61287a30e48a77c5ae79140f792c5cf25 SHA-256: 8543934d723faa446ed06764aefa1bf9c78d53456b95917ac2c4ec36adccfc2f
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a malicious SEO redirector, specifically designed as a lure for free downloads. The embedded URL points to a Google feedproxy, which in turn redirects to a Squarespace domain, suggesting an attempt to obscure the final destination. While no scripts were extracted, the PDF structure and heuristics strongly suggest an attack pattern involving redirection for malicious purposes, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 4

  • 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/UZrB20b2Dcg/square?utm_term=nba+2k18+for+android PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec8832cc9768212243352e/1626114098527/periodic_table_group_iv.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7c8ba81471576eaec018a/1625802938191/college_can_you_kiss_me_first.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e924b1b67368755967f275/1625892017702/xekonodopi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e87f6348e8bf2cd9e4cfda/1625849699334/jpeg_full_form_in_computer.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e89b944471185a9cdc55bd/1625856916323/42539931302.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93603c14ff043cd5d97dc/1625896451523/molojijix.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c8b04c181567023cab22/1625868464577/pazeki.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94a1a787dde1a90af49c8/1625901595014/72914339207.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7cfb402743737595bdc0/1626111227316/nedobopituvagijo.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_off00015687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15687 10492 bytes
SHA-256: 4bf32d98b51a1ad9399f533876d5e748bfdd6c5f6c80a2de55e32a53b016da0e
font_01_sfnt_off00016e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E92 17832 bytes
SHA-256: e6442af1fadb7a8942e743eefa61e54833b09adb6482977ddfba779a67f23bf5
font_02_sfnt_off00019d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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