Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6966ab9a65ccea6…

MALICIOUS

PDF

76.7 KB Created: 2021-04-05 03:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af8e0541f6b8d846d276d5dbbabaef7a SHA-1: 7090345b76978bdd6c79a023c4c18d4ccee8b42e SHA-256: b6966ab9a65ccea635f51dedffa8d7048902b77005ab56b00d8c8e64670524bc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing embedded URLs, one of which is flagged as malicious and associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a school calendar, suggesting a phishing or malware distribution attempt via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=calendrier+scolaire+2020+zone+b+pdf
    • http://nujijaj.getenjoyment.net/52582746946.pdf
    • http://axecheat8.xyz/pentair_fns_plus_48_filter_grids46q57.pdf
    • http://bestplacefor.rest/frank_ocean_lens_v2_downloadvpymx.pdf
    • http://wefilevazobakeb.mypressonline.com/69193182822.pdf
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/9703728.pdf
    • https://nurinakeviwiket.weebly.com/uploads/1/3/1/4/131407921/fa58727d6111.pdf
    • http://nat-yoga.space/loxawazapozijisca6bf.pdf
    • http://fakts.design/how_to_turn_on_zagg_keyboard_for_ipad_prot4jsi.pdf
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/zavewifot.pdf
    • http://damvglaz1.xyz/ejercicios_nomenclatura_iupac_quimica_organicathq7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legesiliv/what_is_the_correct_sequence_to_watch_marvel_movies.pdf
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_87b86e864c0a4c59a58796a7c9cc8680.pdf?index=true
    • https://uploads.strikinglycdn.com/files/52d864a5-cf7b-4ec9-aa48-0d928b72f8bf/69094998406.pdf
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_75d0667a9dd04c1abd04bdc0ad0ca0be.pdf?index=true
    • http://zedowep.atwebpages.com/mefaxuw.pdf
    • https://uploads.strikinglycdn.com/files/339bb3e5-d2e2-4750-9e67-bf994a919006/wevefadogafum.pdf
    • https://uploads.strikinglycdn.com/files/f7845237-255c-4d95-ba9d-db9a0df294c3/punamudunevujob.pdf
    • https://s3.amazonaws.com/votawawo/polk_dsb1_soundbar_bluetooth_not_working.pdf
    • https://s3.amazonaws.com/fidefofudi/74105533136.pdf
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_225c011070194d2ca85c41d8c14efd8a.pdf?index=true
    • http://wilaroxu.atwebpages.com/rewewidanineruminewukori.pdf
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_a70d3a40e1a644ceb64b7f32757524be.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb32.bin
f985c3915a9c6e2b1bf429737d26b240bdeb73e55b0d0bd8df2d6cb1d43a16d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 5516 bytes
font_01_sfnt_off0000fdf5.bin
5b4cd4e41d5bf72232eef7ba2940a33f245e9640cfa071d10a4deb6188f19eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 12068 bytes

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