Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe3515436f7145c…

MALICIOUS

PDF

132.5 KB Created: 2021-07-12 21:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a9c25a0f8c9fec1b65f479b2f20af6bc SHA-1: 05e09e5f524ef5938ccd357d2318075aa9b93912 SHA-256: cfe3515436f7145cac807bcbccb735fd85627045a8fa5f437d5c7e7dcf4e9cbf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an external URI and an image lure linking to an SEO redirector, indicating a phishing attempt disguised as a free download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for malware distribution or credential harvesting. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9690

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/nCRFBnYrBHY/square?utm_term=mothers+class+notes+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7dd874454ab0ddd860b1f/1625808263809/38456790270.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e856e2f9185b76d299087e/1625839331076/1972_ford_mustang_fastback_for_sale.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8b23a1c98860cff5be253/1625862714792/pizemukaziwedanexodimozu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e92bbc27127e680416560c/1625893821164/groin_muscle_location.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e932172c5c2f6215c99a30/1625895447315/abuse_of_process_tort.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e772bc3b38344a270a1787/1625780925005/sozunokewudigiz.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec86a27726b430b4688999/1626113699858/cell_cycle_introduction.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec89597e5cd11affcdcbec/1626114394194/towumanidaxalesikuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e830e68ad60325f0c9a516/1625829606365/javosipafemajasevovo.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_off0001a409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC20 10620 bytes
SHA-256: 7c421619a720a667467ee5be98ffc3a67ca9d561c4b2a326944408d92617731b
font_02_sfnt_off0001d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D466 18656 bytes
SHA-256: 1e3244d4b7bd74105d17e8ea04661bf6905d2df054c04958c095f508bad595c2

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