Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44b3336ef3f717f…

MALICIOUS

PDF

75.4 KB Created: 2021-07-12 20:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 539f50108be62e493202f6ca7a2b44db SHA-1: 4127fb23bc33e5681e1d8ddf13c5fb2af387f8c9 SHA-256: b44b3336ef3f717f3a85e696daffcead4423df5fc73f4fddd555738977d344c3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of an external URI and an SEO redirector link, suggesting a phishing lure for free downloads. Although no scripts were extracted, the PDF structure and the nature of the heuristics point towards a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/~3/9xivtwLAy4k/square?utm_term=if+the+world+was+ending+lyrics+jp+saxe PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8b47d83f100125d09a2b8/1625863293631/27120389050.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e939218ce0e10532d366e3/1625897249778/jinigulepokas.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e86d11b2ee9c5bb7daf882/1625845010150/xavogagizow.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e93d0e92abcc18c4f708db/1625898254368/76562866406.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e77419a9f87deb6ff5f1/1625876340678/cpe_certificate_of_proficiency_in_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8fad28915684aa53b9c78/1625881298364/41737599439.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e93a8cf229ba2ea837c7f3/1625897612192/76428857682.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_off0000c60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60D 15332 bytes
SHA-256: 4acfb66ca02d9b52270d76fcc15e13db83ef23934c91e873dde7a7dd20f2428f
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 11284 bytes
SHA-256: d7dc5cb9b80e35068461134c55d88851b16414772b45925bf3a0da8cd5044c79

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