Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cf0d8765e9a57e…

MALICIOUS

PDF

111.6 KB Created: 2021-07-13 08:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3753b628077e0240d78f3fc6c8337f39 SHA-1: 92d25b71d72e46dd193e5022f2cf379ef4650540 SHA-256: 87cf0d8765e9a57eaf3c7a213a4ba6022535a5913bd6fa3801b09ffe01bd8baa
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-severity heuristic firing indicating an image lure linking to an SEO redirector, commonly used for phishing. The embedded URL points to a Google feedproxy, which is likely part of a redirection chain. While no scripts were extracted, the overall structure and heuristic suggest a phishing attempt disguised as a free download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7738

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/S-4CHg4Qmwo/square?utm_term=fort+worth+arrest+records PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8de4831aaf5e928afb8b/1626115556476/brave_new_world_jessica_brown_findlay.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecc58079af8a1ae19bbb8c/1626129793199/zogafazilusitexise.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e86a86419c280ea9ac43f3/1625844358867/find_the_prime_factor_of_36.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8a6e737faa2302622a4f4/1625859815105/74803254699.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecff4e3b21860fe66bf746/1626144590480/cad_cam_and_automation.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_off0001564f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564F 17204 bytes
SHA-256: 0d3b085f42e87a2bb097282f4e16ec9bb30cce8630c728e35216307b046a920c
font_01_sfnt_off00018375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B8C 10288 bytes
SHA-256: 550f191deadd5fba226328c19301803ffd170d84802eac228a451905dd809fba

Open this report in the interactive analyzer, or submit your own file for analysis.