Malicious PDF — malware analysis report

Static analysis result for SHA-256 7693458be882fa4e…

MALICIOUS

PDF

75.2 KB Created: 2021-03-30 17:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c26fd5c27f0e9c1cf5e24b2f89f66473 SHA-1: 582b8844afa450f157f6d8cce22a111323a0a572 SHA-256: 7693458be882fa4e390c1984bca0eee99daaa92631cc66e68aac35f2adc1a593
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 0.9999

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 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://fokemale.ru/award?keyword=avancemos+2+unit+resource+book+answers+pdf PDF link annotation
    • http://reduslim-officialsite.site/ark_tek_generatorhaqe2.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/TVqfajb/interview_feedback_template.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/ruxifilagivunule.pdfIn PDF document text
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/negakanojujemotute.pdfIn PDF document text
    • http://allostar.buzz/zesovef2kj4.pdfIn PDF document text
    • https://cdn.sqhk.co/balemarize/Sgjlhba/easy_sponge_cake_recipe_2_eggs.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/ygs_saylar_km_sorular7i8ao.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/hi2FDnS/noah_arc_jumping_the_broom_movie_online.pdfIn PDF document text
    • https://cdn.sqhk.co/mezewimaxus/gids3Ug/laditopijapobowuval.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/ejercicios_de_adjetivos_demostrativos_en_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/nlYsU2s/wevat.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/apostila_auditor_fiscal_da_receita_federal_2020_gratis.pdfIn PDF document text
    • http://sonuzevemuguke.iblogger.org/dscr_worksheet_for_term_loan.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/iiaRwid/97409092275.pdfIn PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/1801748.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumumewevebav.epizy.com/zaroxadikufezuxem.pdfIn PDF document text
    • http://pukevekoba.rf.gd/26717673512.pdfIn PDF document text
    • http://zusirutovazume.epizy.com/barcode_reader_software_for_android_mobile.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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 5744 bytes
SHA-256: 6f6d3792dd9c06d5e909e198e2cdcb2dfab8c7c7f20cb263625718ee13e92dc6
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 12488 bytes
SHA-256: 885a29af714da025447b0d0fa7fbcd0088f7828266065e01dfdd6ff795cef2dd

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