Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afcd2debe831120…

MALICIOUS

PDF

80.9 KB Created: 2021-05-04 13:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 184cbde1bb5d32e495b8b2b189d0e2b3 SHA-1: 914d7b6a93cdf1755c7c4512175ec773354ebee7 SHA-256: 8afcd2debe831120ffda2d1736edc8c169ac0ed8501c4707470e14f32c7d19d4
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 0.9993

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://jacksth.ru/strik?utm_term=what+are+structural+formulas+in+chemistry PDF link annotation
    • https://wanusasa.weebly.com/uploads/1/3/1/0/131070791/zokazegigos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_603d191fd3acd.pdfIn PDF document text
    • https://wojemalivameju.weebly.com/uploads/1/3/0/7/130775107/zasakoxoxe-nilinij-zojurazikudili-sewanuvu.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/vetazurotezodexegu.pdfIn PDF document text
    • http://ellmax-site.xyz/update_my_garmin_nuvi_255w_for_freeb1j3w.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/8996788.pdfIn PDF document text
    • https://vezikiga.weebly.com/uploads/1/3/0/7/130739663/tenotisiriwonebisi.pdfIn PDF document text
    • http://dorightschool.com/accursed_share_bataillem5lfp.pdfIn PDF document text
    • http://andyhongdigital.com/calculus_1_limits_problems_and_solutionsf8wt9.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/riwedaxakuwolo-takabakedajo.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/4293286.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/k8EQ02Z/comparative_adjectives_and_adverbs_worksheet.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/pudulapo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457296/normal_5fddf9d215ea1.pdfIn PDF document text
    • https://loxojewumiv.weebly.com/uploads/1/3/4/6/134651611/90d945a8.pdfIn PDF document text
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/zakulejizoz-lebovusukiv.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/febol_vesazemud_fegot_jezugap.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/V5UjgMN/g_cloud_backup_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • http://5dradio.ru/manupolibimepdaok.pdfIn PDF document text
    • http://hayatevesigar.online/aladdin_song_masstamilansx1e4.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/tGhgjdc/mefalakaramenesimovewop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444102/normal_6007993876bf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 5236 bytes
SHA-256: ae7e65a46721327782e7b71b8a2acf6610918cbaf9915c627b1d52a3e9f40b8a
font_01_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 11000 bytes
SHA-256: 6523b1d3de1af0c59adf02b62f4946e130fb16fce06f1c1a23cf20591e28dea3