Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ff515947cd295f…

MALICIOUS

PDF

74.4 KB Created: 2021-03-18 12:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 281d8b7ab2c5a293ea04bc35d440ecd6 SHA-1: 5638723022cdbe6347329b62b23ed9a76e5a9384 SHA-256: 95ff515947cd295f4c1d3ce0fa782dad0e5c152a6d9539ed579d2c6744e470a4
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous external PDF links, including one to 'kuzutuzo.ru', suggesting a phishing or malicious content distribution attempt. The presence of embedded JavaScript, though not fully detailed, combined with the external links, indicates a likely attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/wix?keyword=ambient+weather+weatherbridge+manual PDF link annotation
    • http://jesiwufap.iblogger.org/4313359412.pdfIn PDF document text
    • http://betixisu.22web.org/79230021850.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/english_grammar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_7b491eb2870946d685b2323ad6e51746.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/sms_peeper_code_without_survey.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_349f21d6ffa84de1959bf572d82c72df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06324ba-fcae-4f6e-b332-fe7fe04e79ec/i_am_number_four_book_download.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_25d7f21aa45b4eca87658b417ef9445a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/educational_psychology_doctorate_ireland.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/ff14_fashion_report_100_reward.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/vetevidelu.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/aptx_low_latency_android.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/butterfly_song_korede_bello.pdfIn PDF document text
    • http://nosijatigatu.epizy.com/plagiarism_report_website.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_be939f0193d8484cad67c9a9f59ff9ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e70e6d5-2eb4-4007-9f3c-5366825d43e0/fezopudalafus.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/2504146298.pdfIn PDF document text
    • http://ledufowi.myartsonline.com/88759269224.pdfIn PDF document text
    • http://rutuvofogiseba.epizy.com/fominarabi.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/grammar_exercises_online_mixed_tenses.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/how_do_i_connect_my_denon_receiver_to_bluetooth.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 5280 bytes
SHA-256: 87b021b57f657a7929b7d852babbed374cff48422fce0c340996dedbe691b72d
font_01_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 11096 bytes
SHA-256: ecb245f5446a04538beeb35ea7827cae887a28aaeacb1be9f5580d925ab1c562

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