Malicious PDF — malware analysis report

Static analysis result for SHA-256 d378445da15f2b59…

MALICIOUS

PDF

98.8 KB Created: 2021-07-15 20:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6851f97ed4dbd94ab024695fb0642b22 SHA-1: d1dbe323f4b19280b29afd9459e19e5d3b4ab6cb SHA-256: d378445da15f2b59e01b7a169447e2b740e14f84f8838599144c72101f24027c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-confidence heuristic firing for a redirector link, specifically designed for phishing via free downloads. The embedded URL, 'https://drafthe.ru/square?utm_term=a+level+physics+questions+and+answers+pdf', is the primary indicator of this malicious intent. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest it's part of a phishing campaign, likely leading to a malicious payload or further phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/square?utm_term=a+level+physics+questions+and+answers+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edc06dd6548a387fd01bc2/1626194029966/non_living_things_outside.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed5f19dacdbe35d6293b14/1626169113828/rovitexemu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edd39aebcbe27d0c7cc533/1626198938860/11038044442.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7e4674aaab0286a8af262/1625810023126/fontaines_oyster_house.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f067f71e6fa57ab570c042/1626367991412/bad_lobster_tail.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e903ce58c6623f0380ffaf/1625883598838/little_fires_about.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8e850e370ac6322862d4d/1625876560721/26420485584.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee3f23df274736e0abb6ea/1626226467503/wegimirikapove.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f051fbee8e766e6155ad9d/1626362364026/fomoraniwimogabevigobit.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e80a6fa3609a707bae0b72/1625819759786/31173805646.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_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 11212 bytes
SHA-256: 6697a587431b08829e46a7acca88faf8c36d2189f7be22b3e1be19fb3555716e
font_01_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 17364 bytes
SHA-256: d7a8dee2a50da27614cb26cedb7426aa3fdf20d5132421e5b3fd948a53e8fd64
font_02_sfnt_off000166ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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