Malicious PDF — malware analysis report

Static analysis result for SHA-256 f777e471bb4988e9…

MALICIOUS

PDF

79.7 KB Created: 2021-06-03 23:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: af304686525f7d9ab300d8dc4af07821 SHA-1: 72f78ec43fb9f918a5ec01a1e803ea3ad73df00f SHA-256: f777e471bb4988e9f67686e6baf76e0e81276d10b2d1af90c0dfbefcd8db7add
186 Risk Score

Malware Insights

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

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 0.9997

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.
  • 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://pelibifir.ru/123?utm_term=esic+hospital+online+application+form PDF link annotation
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/5eaefdbc.pdfIn PDF document text
    • https://wadodimimilupe.weebly.com/uploads/1/3/0/8/130873890/2d738027.pdfIn PDF document text
    • https://fexazajix.weebly.com/uploads/1/3/4/6/134669695/mavitiw_bofareriteru.pdfIn PDF document text
    • https://vakugisup.weebly.com/uploads/1/3/0/7/130739558/winukedekoz.pdfIn PDF document text
    • https://bozexiwagufib.weebly.com/uploads/1/3/4/6/134695017/woxosefifamafe-kelinamebeterux.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/8986957.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/8874446.pdfIn PDF document text
    • https://tizamanana.weebly.com/uploads/1/3/4/8/134877207/potawu.pdfIn PDF document text
    • https://faraxebeg.weebly.com/uploads/1/3/4/4/134475962/7c47b814020c5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_6036dad5531fb.pdfIn PDF document text
    • https://dexisuliraj.weebly.com/uploads/1/3/5/3/135346252/revopuvelikiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376362/normal_60025a517e7ec.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/0aa3201478aeb3.pdfIn PDF document text
    • https://busuguzokiw.weebly.com/uploads/1/3/1/4/131406797/tixiwijix_zugijejiki_nomemaxiniwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_60153a22df86c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144568095/comment_draguer_une_fille_quand_on_est_timide.pdfIn PDF document text
    • http://fuvotobike.pbworks.com/w/file/fetch/144492642/jogupafepupudo.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144426099/madras_university_arrear_exam_hall_ticket_april_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11493910-9067-41a5-b399-f2c282d392f3/12705938667.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/61730349400.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144569637/bugawonagixolop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/318f38e7-8d0f-4e61-8d6b-07f849db5708/31754941728.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_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 5212 bytes
SHA-256: c678ef6edea4cba315f71a84de86544c5ea87acbb9a9ff46364f940cbb162bc1
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 11936 bytes
SHA-256: dbddb6ba3346bef182837b071f2d45c40ff1e7ea250bd0ac49bd9bee7d4f8d59