Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c86ef2e9bd91c83…

MALICIOUS

PDF

129.1 KB Created: 2021-04-21 23:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f865f01729d16f1f141dc6f8e7e712a3 SHA-1: e6185e1e30e76a607b260e0e4d7453614fd98329 SHA-256: 9c86ef2e9bd91c836096cbd8d3988ae3170ea40b0e8f6c6446593cf15bab8ee8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=calories+in+taco+bell+burrito+supreme+no+sour+cream PDF link annotation
    • https://cdn.sqhk.co/movumatoz/1ghvghQ/iphone_fish_live_wallpaper_for_android.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/how_to_replace_sump_pump_backup_battery.pdfIn PDF document text
    • http://fitokaps.xyz/acca_f3_exam_questionsucnhm.pdfIn PDF document text
    • http://dagomakiluje.iblogger.org/fsr_pressure_sensor_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/aEEfxI6/dogulodezakogigoxutedade.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdfIn PDF document text
    • http://lightly.store/tidalasegawxxzl.pdfIn PDF document text
    • http://netewe8.xyz/18811158849kvmll.pdfIn PDF document text
    • https://cdn.sqhk.co/vedoreket/hihghjC/marching_band_stand_tunes_sheet_music.pdfIn PDF document text
    • http://hamsterbig.com/sotomas113jp.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/cuisinart_keurig_troubleshooting_descale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_604fbcd1784fa.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/8hgjdib/the_room_2019_common_sense_media.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414847/normal_5ff60d58b1a05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palelezugob.onlinewebshop.net/rofobuwamimoxiw.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/adobe_indesign_cs6_free_windows_7.pdfIn PDF document text
    • http://rabelame.atwebpages.com/gojoxararukanogejuneli.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/75335258722.pdfIn PDF document text
    • http://zevinabimiw.epizy.com/wusamomesiwumosoz.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/tiribiwuzagefejodunoxaso.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_off0001be27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE27 5124 bytes
SHA-256: 440cc49fb8a6cc70b149fd357d033cdcd911ec582eb4f63efaf390a48ddba403
font_01_sfnt_off0001cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF76 11628 bytes
SHA-256: d3e2d60c145df7b2083e4cce165fa938f8b53cbe9e5d8c7d72f754a846282e7a