Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa021f228bc5da6f…

MALICIOUS

PDF

76.7 KB Created: 2021-05-02 02:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffd497b10bf165451c4f67384b1d7e26 SHA-1: 5f2913e135bb09f215aa72593cf9146ef58fc2bb SHA-256: fa021f228bc5da6f0523ff39f1c582729b4513ca30994c73bffb84990dc8eccd
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document body, though heavily corrupted, contains text suggesting it's an 'Aps employee calendar 2019-20', which is likely a lure. The presence of numerous external URLs, including one directly associated with a heuristic firing, indicates a phishing or malware distribution attempt.

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://zajinet.ru/strik?utm_term=aps+employee+calendar+2019-20
    • https://cdn-cms.f-static.net/uploads/4403816/normal_600fd80597c23.pdf
    • https://cdn-cms.f-static.net/uploads/4368250/normal_602e704aaa8b7.pdf
    • http://lejunuzegakikuv.mypressonline.com/bekovifigujuwexof.pdf
    • https://cdn-cms.f-static.net/uploads/4449783/normal_6024ada106548.pdf
    • https://cdn-cms.f-static.net/uploads/4368229/normal_606a70fbe153b.pdf
    • http://naturaleone.space/chunari_chunari_instrumental_ringtonesm74l.pdf
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fcaf951cb1c4.pdf
    • http://samoe-samaya.ru/easy_guitar_songs_with_chords_and_tabsroyef.pdf
    • http://bachanalytics.com/zuluponusozosiboxegexoplxsa.pdf
    • http://vashe-zdorovie.xyz/general_contractor_agreementoqmnm.pdf
    • https://cdn-cms.f-static.net/uploads/4470839/normal_6011cffb1a196.pdf
    • http://raicen.com/periodic_table_trends_worksheet_answer_keyg74kb.pdf
    • http://icub.tech/can_i_use_my_steering_wheel_controls_with_an_aftermarket_stereo5k4xb.pdf
    • https://cdn-cms.f-static.net/uploads/4471475/normal_6061d4f2117c3.pdf
    • http://instapriz365.site/2119488992077opx.pdf
    • https://cdn-cms.f-static.net/uploads/4368506/normal_600a4f3849fd8.pdf
    • http://fredo.bike/ccrn_review_book9na2m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mexijegedakol/six_pack_abs_workout_at_home.pdf
    • https://s3.amazonaws.com/regovadeje/antonyme_franais_apk.pdf
    • http://vokesakogo.onlinewebshop.net/imax_b6ac_v2_software.pdf
    • https://s3.amazonaws.com/feseni/29525143690.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://scripts.sil.org/OFL
    • 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_off0000d753.bin
2a321fd4e087794c9aaa7f37c7a8ed51154dd80613472f6fa86cc5ba7eb154e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 5824 bytes
font_01_sfnt_off0000eb1f.bin
ffba9c7e7acc87a4dcd966e18aeac724fb6864788cd336fb01575bf0f7b136b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 10600 bytes
font_02_sfnt_off00010f51.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 16060 bytes

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