Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b17209abfb099ef…

MALICIOUS

PDF

71.3 KB Created: 2021-07-12 23:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a3bfe5de0bf044c182ef0455b94e9e9b SHA-1: eebc9f0c6a24ddbc7b9276f80e94c80d4b8cd47a SHA-256: 8b17209abfb099efe6f77c258785380e5a8eabf7e7898921ab689d7267ebe55c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a redirector URL, which is a common lure for phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of a redirector URL suggests an attempt to lead the user to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8216

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/gPkW7oTCsL0/square?utm_term=cbhf2+battery+charger+manual PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec833a59713006cbe1682a/1626112827052/65058027219.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e80ea2adf2c268820290d9/1625820835059/basodokinuduvazev.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e91ee02210ba6bce121210/1625890528638/36049378590.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec924b934d360eb2897d73/1626116683890/cheapest_states_to_retire_in_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8ff7ec0906550d909d841/1625882494203/sitigajoxufirijefagilobuj.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93A 10908 bytes
SHA-256: 6ece7ffddb5c9b5a9ab80ccd1c2da0662de0f98427f5d9921844482046500fa6
font_01_sfnt_off0000d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 15328 bytes
SHA-256: 1f4980d87745ac30806b51a43e10c2cf1caa2642a3e49bf7e759a2e961e77cca

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