Malicious PDF — malware analysis report

Static analysis result for SHA-256 658c847cd0934bb0…

MALICIOUS

PDF

75.0 KB Created: 2021-04-16 14:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 462ad7cb57312c7f82af233c58c1ae5a SHA-1: 1bc519acab008fecdaff8eb74d075836839fc5a0 SHA-256: 658c847cd0934bb0adc18b31aa94046dc31c3e831f8b2e82ce5bdd726474f50f
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 0.9960

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://golowaki.ru/strik?utm_term=gmat+sentence+correction PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403129/normal_605709dcb015d.pdfIn PDF document text
    • http://pollsexpert.com/gisizifizel1iwl.pdfIn PDF document text
    • http://sale20.site/kixoki3qion.pdfIn PDF document text
    • https://cdn.sqhk.co/jomenuluz/KOMhejc/puzezizu.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/ipWpugj/asteroids_game_one_motion.pdfIn PDF document text
    • https://xujufefar.weebly.com/uploads/1/3/1/4/131483110/9713628.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/86342731550.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/7528697.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/xisapabo/ii71Hhg/report_lost_driver_license_ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_605ac9df32e6d.pdfIn PDF document text
    • http://connexion-amelii.xyz/how_to_thread_brother_sewing_machine_bobbinj7dgq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_5fd3417d63a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_60489133dc7a7.pdfIn PDF document text
    • http://health2health.online/tabela_preo_veiculos_usados_fipey1ss2.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/dyjgX4s/fresh_strawberry_cake_recipe_with_jello.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/nakugubumix.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/fundamentals_of_cost_accounting_5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_60187e6c1e2b1.pdfIn PDF document text
    • https://cdn.sqhk.co/bukevexej/hjheAig/15526084695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fdd4af9236c3.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/nosubegutilif_pozugujafura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_604f51bd1f84f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fffb3c1c3202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_6011c5983d255.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/telugu_academy_intermediate_1st_year_botany_books_free_download.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_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 4944 bytes
SHA-256: aa934750b8e1ea8fc859562d013e83dd999945adb5ff002f2f9657a2dcfcb824
font_01_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10792 bytes
SHA-256: 1660152d9d14bca6a1ecb3331fbaca80c618b8923e151c7e48659cca97c600bb