Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe043b850d8febc…

MALICIOUS

PDF

74.7 KB Created: 2021-02-21 06:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2d5fccad8147a20545a397b2bd81f7a4 SHA-1: 4d36db3c6a583e944112a86c7d3b06a4e3dda1ae SHA-256: cfe043b850d8febccddd3e5349356f2e6d1cf27e671e3f949366b1d66a4f12ac
134 Risk Score

Malware Insights

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

The file is a PDF that uses a lure of a 'blood word bank worksheet' and urgency language to entice users. It contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=blood+word+bank+worksheet PDF link annotation
    • http://beststudent.space/wugaduja67b3o.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/oieMhck/94745222505.pdfIn PDF document text
    • http://jadebey-x.com/895926354816v6n7.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/repajifupofe.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/gWQThaC/airport_control_games_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/hgeihie/hidden_objects_free_online_no_downloads_required.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/ejgibig/47112215992.pdfIn PDF document text
    • http://tronreserve.online/masixupivodepejeteurrw7.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/xujutusagoxusila.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/ggjhbAo/green_bay_weather_monthly.pdfIn PDF document text
    • http://istlan.fun/55869594128cclbk.pdfIn PDF document text
    • http://arnautmebel.ru/gubendaglt.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/aahhTTA/nojukusapapevid.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/ihjsbhe/rudabaduwigoji.pdfIn PDF document text
    • http://graatorama.space/togaf_9_certified_study_guide_3rd_edlcory.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/7794901.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/wanasu-mibavose-lixut-viwipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/widiku/60716528848.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/multiplying_and_dividing_polynomials_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/avengers_theme_song_piano_sheet_music_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/offer_letter_format_for_school_principal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 5000 bytes
SHA-256: f7e75dc0ae80d7da6690f92a78365a45e32e06e428df89ce06e090325e4b186e
font_01_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 10656 bytes
SHA-256: 7eb3088ea17e79803710fd2c045f78bb46aad6c87ecc85a0e04027d151e8e6dc
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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