Malicious PDF — malware analysis report

Static analysis result for SHA-256 1055aded6b578d2a…

MALICIOUS

PDF

85.9 KB Created: 2021-03-11 13:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ad7e0ae8df4ba422acb719e0010f641 SHA-1: 74b8c6f4d858ba7f9d9cd4b27a2636a8a6dccc2d SHA-256: 1055aded6b578d2a0a8c8e02fcb4f4076500294fc919baf46f51bdcaeda77758
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially malicious websites. The embedded URLs, such as 'https://druttle.ru/award?keyword=arthroscopy+instruments+pdf', are likely used to disguise the malicious intent and appear as legitimate search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://druttle.ru/award?keyword=arthroscopy+instruments+pdf
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/821b5c07b.pdf
    • https://cdn.sqhk.co/ribobujir/f6shfji/counter_terror_sniper_shoot_mod_apk_download.pdf
    • https://rokubupudila.weebly.com/uploads/1/3/1/8/131856034/d7517e95da29184.pdf
    • https://cdn.sqhk.co/niserutom/gnrZZQG/taptap_apk_download_global.pdf
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/gaxujibaw.pdf
    • http://xsafak.com/84864733768dh6wz.pdf
    • https://tebizojejifijof.weebly.com/uploads/1/3/4/5/134589629/xowepu.pdf
    • https://cdn.sqhk.co/zikonidenijo/cmjbs7S/real_street_drags_great_lakes_dragaway.pdf
    • http://blacklaser.ru/omron_body_composition_monitor_with_scale_manualsspk9.pdf
    • https://cdn.sqhk.co/nezusoxe/hcjjjhP/matrixyl_3000_serum_uk.pdf
    • http://lnstagram-help-businesss.com/bibefexapaxuxevd0qd6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a05191ad-796c-4e61-b0a8-150005e228f7/a_canticle_for_leibowitz_audiobook.pdf
    • https://s3.amazonaws.com/nufidibodudulad/breakfast_potatoes_nutritional_information.pdf
    • https://s3.amazonaws.com/golepe/java_64_bit_minecraft_windows_7.pdf
    • https://s3.amazonaws.com/fewifuwu/audiosurf_full_free.pdf
    • https://s3.amazonaws.com/kefodek/linzer_torte_sheet_cake.pdf
    • https://uploads.strikinglycdn.com/files/a9d45a91-cd59-4f63-9880-10ee439a641a/acer_aspire_e15_bios_setup.pdf
    • https://s3.amazonaws.com/faluzotixupi/holy_priest_classic_leveling_guide.pdf
    • https://s3.amazonaws.com/veledabejufi/bajrangi_bhaijaan_songs_mirchifun.pdf
    • https://s3.amazonaws.com/supefujoxopubu/authorized_representative_i-_9_form.pdf
    • https://uploads.strikinglycdn.com/files/12946dad-bc53-4060-9582-7bcea8a07810/bazar_ahe_band_mp3_song_download.pdf
    • https://s3.amazonaws.com/titugome/80047174014.pdf
    • https://uploads.strikinglycdn.com/files/531e0ec3-07ab-4cb4-a25d-bbbcbe694403/tell_me_a_little_bit_about_yourself_interview_question.pdf
    • https://s3.amazonaws.com/mejifavo/past_continuous_affirmative_negative_questions_short_answers.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_off0000f1cb.bin
d8920f6b3a5bc0abf7f779af921aa68355bce6dcb5a75f7cd3d414b570ca6b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 5244 bytes
font_01_sfnt_off00010388.bin
2e72bf45478f03bca02584b9c8bea3bdb2c757fe39254b644b6f14b588267734		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 15096 bytes
font_02_sfnt_off000132a1.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 16164 bytes

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