Malicious PDF — malware analysis report

Static analysis result for SHA-256 721e2828b8041072…

MALICIOUS

PDF

81.4 KB Created: 2021-07-21 19:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 574f7ca739746ed709389bcab85af5b4 SHA-1: 1f4a4577ed8f87372874e5bc4ecbcc64af7d782c SHA-256: 721e2828b8041072fb19ea18ee613af472308aff6ace6ea68fd60fbd6f5bddad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains embedded URLs, one of which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although the document body is heavily obfuscated and unreadable, the presence of embedded URLs and the high confidence threat detections point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/AG-UZpNbJGc/square?utm_term=electrical+circuit+protection+devices+pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8be32e534972f7b796aac/1625865779062/74300118271.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7e354c0b954f9ea3a95a/1626111541653/new_fun_unblocked_games.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f3a2010b1749089211b44a/1626579457587/erg_theory_and_maslows_hierarchy.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f249024b68c137e691526c/1626491138784/20_mb_is_how_many_kb.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee901a86aa876280c0e82d/1626247194353/18905693873.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e932ea37cb904475609071/1625895658953/fubilet.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f3673181f38b20588809ba/1626564401453/xarodovudanelesad.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f08d77d1840e180f1c1233/1626377591947/53540634563.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e84666ad723f3b6758fb35/1625835110547/pafopedilo.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f2e4a22be78d526595b7c5/1626530978057/queens_of_the_stone_age.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec85635c244202458b97dd/1626113380013/tri_cities_daily.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca1853080d76c7a539cd9/1626120581411/5416459145.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecb307b5b6766af3e1d6f2/1626125063691/sumaledidelulamutevuxusuj.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f4960d54c26a0cc3096688/1626641933721/frontiers_of_environmental_science__engineering.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0b39f96ce9b33d72a1360/1626387359881/fovopanetodubijo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8cb47d354a5e86a36e5f/1626115252960/64310568024.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec890ac8b0d544b6d82e58/1626114314976/ser_in_the_conditional.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c07b596d362fd0fbaa23/1625866363445/baxelejopapil.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e935168ce0e10532d35057/1625896214845/defaulter_meaning_in_english.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_off0000daf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 16792 bytes
font_01_sfnt_off0000f310.bin
ff47465077204f7fec9862c9f56364cc223806a9be20bce86195af2695d7d80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10764 bytes
font_02_sfnt_off00010bec.bin
0bd561cf050af4aa84c4b3e30f6dae66ec54ef84ab91b981c718d0cc7800c668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 16052 bytes

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