Malicious PDF — malware analysis report

Static analysis result for SHA-256 f735a4a1bc789651…

MALICIOUS

PDF

75.2 KB Created: 2021-07-14 08:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 23632853f701bf38795ced4930e0970e SHA-1: e62420b911d08d8b9146e934faa82cd0113d7029 SHA-256: f735a4a1bc7896514697261505046e5b74c3d93ae4e7c4b8726a17226f261df0
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to a URL. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI point towards a common phishing or malware distribution tactic, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9186

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/ZFaGRQ6RLlg/square?utm_term=10+oz+to+g PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d4b300b83d0a108879f0/1625871540035/cars_with_manual_and_automatic.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8f3a69d4b6336147dc75/1626115899062/bupiduguboboloxoroza.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed69314bcdcf6393fdde65/1626171697714/alkaline_earth_metals_on_periodic_table.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edb0a376150b527e9cb995/1626189987684/fin_for_yourself.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e84a3fd580de0300b69b40/1625836095522/58443857935.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_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 17148 bytes
SHA-256: 4348fad3d620b33cc3acc3ecc1d35b95abca4584d16584df4ef21c3b334a42a1
font_01_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 9616 bytes
SHA-256: 60b0983e56545f12d0dc262ff44ffe1b600ac9f203844abc64da23cb77712635

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