Malicious PDF — malware analysis report

Static analysis result for SHA-256 681a39d6c2aaf0a2…

MALICIOUS

PDF

85.2 KB Created: 2021-07-23 03:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2aa7922ac6edf32f849501824d512c0d SHA-1: cf41b921f33f54798873796f2798e76ea6cd1ca1 SHA-256: 681a39d6c2aaf0a266725aab136c037aa578df5d5f2c97f6a2eea6e504701448
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected 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 users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/~3/7R6buoffwiA/square?utm_term=red+cabbage+pineapple+slaw
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60fa07b27c0f07413a8ea588/1626998706317/vekuwesufuwosomotulela.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f511246d5e991e36f528cf/1626673444797/gfr_rate_meaning.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee4d893753dc428c896bd1/1626230153750/obvious_in_english.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed93cccd0cb17c762dddd6/1626182604988/70195388157.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee5251e7148d06bc7254a4/1626231377794/81919716386.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f966882cbef40372227f3d/1626957448745/free_printable_cut_out_letters.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8d800c81c3e1fd72a3931/1625872385057/87978868134.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8a7359713006cbe248a8/1626114675625/crp_110_means.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecad0210fbb85b140c2577/1626123522920/sisifunoxexiw.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f3bb7d0b174908921297d2/1626585981778/orange_and_purple_mixed_makes_what_color.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ede22e9779423221e060cd/1626202670996/end_of_days_watch_online.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f00f3324fa75375d85a409/1626345268025/fiwik.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1f072d4d27c6a5bb43274/1626468466506/61894934387.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efd36c5740a719f4aa4a7a/1626329964233/the_winner_stands_alone_summary.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f3228154c26a0cc3f98107/1626546817631/reading_for_the_brain.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec93f5243eac6055d0349b/1626117109447/fejifowim.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f6bad52b685a1a6c5fb65b/1626782421175/89390403209.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f5b797a560881e1f4d6093/1626716055281/libexawojedexajik.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f329e125edf1230658a2d3/1626548705949/leginurogikunitokibimin.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_off0000eb54.bin
cbe7e9a85f073040fe7d3b2d54b53d7fce9af6a1edfddc9877777b557b9d125b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 16916 bytes
font_01_sfnt_off0001175c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 16792 bytes
font_02_sfnt_off00012f73.bin
45aa85feab73145c2fb994b1dc85ef4d39ce3fad887e0c6e1612d13f945fec90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 10640 bytes

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