Malicious PDF — malware analysis report

Static analysis result for SHA-256 099156baee6b3ffc…

MALICIOUS

PDF

98.0 KB Created: 2021-03-23 10:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ed3a8798390937a0f3406a777475651 SHA-1: 830ad396fddae61e1f813050a3ae20e67a872dd2 SHA-256: 099156baee6b3ffc93de0397b1ef1bcdc651087f61cdf5b8f4dade9bc5cf2f56
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs, with one pointing to 'nipisod.ru', suggesting it's used to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to graphing and worksheets, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nipisod.ru/123?utm_term=graphing+nonlinear+functions+worksheet
    • http://bazunujovi.scienceontheweb.net/solved_questions_on_mathematical_induction.pdf
    • http://amorexpo.com/bokeh_effect_png_zipt4hr9.pdf
    • http://rezonansmusic.com/gebadubak9ct1n.pdf
    • http://krepezh.guru/observer_reporter_cutest_baby_contest_2018t4foh.pdf
    • https://cdn-cms.f-static.net/uploads/4366637/normal_605549eac1b37.pdf
    • http://myluckywin.site/at_t_prepaid_refill_card_number7g1dv.pdf
    • https://static.s123-cdn-static.com/uploads/4418747/normal_600482a4f21ec.pdf
    • https://static.s123-cdn-static.com/uploads/4365546/normal_5fffd09dbf8b4.pdf
    • https://cdn-cms.f-static.net/uploads/4461505/normal_6050fa18bcd0b.pdf
    • http://natenezen.22web.org/fufevisojuvuzaga.pdf
    • https://cdn-cms.f-static.net/uploads/4367680/normal_603d3a6f71985.pdf
    • http://nijalatol.mypressonline.com/6160_keypad_user_guide.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://witimalolikoji.rf.gd/sabiwawusuwulinebi.pdf
    • https://uploads.strikinglycdn.com/files/8bad0d13-d7a7-4a8f-a4c9-9bd468298a87/boliti.pdf
    • https://uploads.strikinglycdn.com/files/ca60c64c-5031-4a56-b24a-83a4daec027f/how_to_sync_petsafe_1000_remote_to_collar.pdf
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_01783beabcab40d4842367589491bf36.pdf?index=true
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_b80c6044ce2247c3b35e8facc308a996.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2423af5e-f46b-4d02-8bc2-019f0b5e3db5/will_stock_market_crash_in_2021.pdf
    • https://uploads.strikinglycdn.com/files/a0c11e29-7286-43b0-bbe3-138b46797406/extreme_and_restricted_utilitarianism.pdf
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_ca574e7289234beeac1ace0797807b59.pdf?index=true
    • https://uploads.strikinglycdn.com/files/32360214-43c0-493e-846c-5e044888d83a/plantronics_backbeat_fit_headphones_review.pdf
    • http://vavadot.onlinewebshop.net/top_ten_operating_systems_for_pc.pdf
    • http://gibexuge.rf.gd/19863051144.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001106d.bin
a4b29df9a43cf112641e93de32e83592218b540e466e5836746706ded28f7d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 6760 bytes
font_01_sfnt_off00012156.bin
cc3fbedfa475e59724ea0b8f0962a7676b4942084d435db659addecc682e9a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 1812 bytes
font_02_sfnt_off00012a39.bin
bbbbdb3a139aee834cd3ea2b79cbbb61d198c5bcf733a2d1ed1da82939ed4269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 5464 bytes
font_03_sfnt_off00013ce3.bin
4551c702fd23b9149318b9708b5d47cfbaa0dc8e320272e9a9206d8b58990e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE3 11404 bytes
font_04_sfnt_off00016405.bin
f4a8d95942adf9238caade498e92d91c08bc744c9f37873277fa6766f2767ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16405 16080 bytes

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