Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fffc11c73dcab8c…

MALICIOUS

PDF

83.3 KB Created: 2021-07-21 16:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2565f74a9785469a123d3e56c2c8d223 SHA-1: b8ab349d0de46274f9f4e21bc94d9de182187173 SHA-256: 4fffc11c73dcab8ce359e12f2703e7e240173d54615c0be3a615ca5431895c4b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to external resources. The PDF structure and the 'wkhtmltopdf' authoring application suggest it might be used as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/razvivatel/yapz/~3/AG-UZpNbJGc/square?utm_term=how+to+use+an+image+as+a+background+in+powerpoint
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f675e8bc1c1a7c986f9836/1626764776753/komaroxuvogixegesezul.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f2ad5f2be78d526593dfca/1626516831416/ttp_in_medical_terms.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edcc2fa50f6e33a322329b/1626197039848/sufavu.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee2f67796bb0196c60b7cd/1626222439431/16867012712.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee41ebbb85ab7f02bd36cc/1626227179597/zijato.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f3cb891ad9bf1c32b931cd/1626590089753/therefore_in_beginning_of_sentence.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f6415abc1c1a7c986d1f39/1626751322478/question_paper_for_bsc_nursing_1st_year.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93a411448b0619849408e/1625897537220/additive_identity_of_real_numbers.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f4c08f80d83038fa923a77/1626652815556/39285141181.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e870175cb19a0186db5860/1625845783364/a_haunted_house_full_movie_free_online.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f34d61de9f7d6ab7bb4f4b/1626557793249/theme_of_madness_in_king_lear.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f4a95d9471b562af1fdd02/1626646877259/22876367667.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f2b978783e880aac7876ef/1626519929303/bomemukazusugerulutex.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1cd092a304512fad53a0c/1626459401695/lerigukimo.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f3032826e2e727c25d833c/1626538793117/wigapokog.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edea89f6d8087912bfb5d8/1626204809849/mathematical_foundation_of_computer_science.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f41ace860d895b482efd21/1626610382549/bikomegunijupexipaxuzim.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecab6951a87c5d75afaa90/1626123114090/waxozorototu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e270.bin
1ce705bee877c0d758153e9f0af0435963b0f2d9f7bdf9c4429c90efc43c24c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 11220 bytes
font_01_sfnt_off0000fc59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 16792 bytes
font_02_sfnt_off0001146b.bin
760ad294d04dfcb94ae0508ec253680e86b2217df5aaf4bfa291979e5516556a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 16896 bytes

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