Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cb2341ceb44a68…

MALICIOUS

PDF

79.2 KB Created: 2021-03-03 23:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ae84a84ba13719b78adc445aa57f304d SHA-1: ac14f8aed8cb2380377e886936f6028a64bdd71e SHA-256: a6cb2341ceb44a682301d5b1b208270216caa9137749e0764081040951eda66f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/aws?utm_term=how+to+seal+printable+vinyl PDF link annotation
    • http://lekezoreg.22web.org/coastguard_northern_region_annual_report.pdfIn PDF document text
    • http://sixawuragime.iblogger.org/deathblow_xenogears_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415951/normal_5ff685aff1cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_6020d0a1b295e.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/can_i_watch_news_of_the_world_on_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5fc5a0e321259.pdfIn PDF document text
    • http://hotita.fun/jabomorewodadn85q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487206/normal_5fdf4c71ee39a.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/what_are_the_three_main_cognitive_theories.pdfIn PDF document text
    • http://copyright-help-report.com/how_to_become_diver_in_indian_navyf8nrq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fe19cb6d29b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafojifonetawaj.rf.gd/8157602781.pdfIn PDF document text
    • http://jegafat.rf.gd/54384690819.pdfIn PDF document text
    • http://zanevijid.epizy.com/cairbar_schutel_livros.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/7351984987.pdfIn PDF document text
    • http://gelopet.epizy.com/crucial_conversations_performance_review.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/igora_royal_e-1_how_to_use.pdfIn PDF document text
    • http://fefadipif.rf.gd/keto_diet_recipes_free_app.pdfIn PDF document text
    • http://dimonejoxu.rf.gd/muboja.pdfIn PDF document text
    • http://viganoxoloni.rf.gd/brother_in_arms_2_pc.pdfIn PDF document text
    • http://seredafurikir.rf.gd/business_studies_class_11_textbook.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_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 5168 bytes
SHA-256: 1a2638b0377e046655e643a641e7c793d51a797854b5f229b79cc91a5f65053c
font_01_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10960 bytes
SHA-256: 32d1b4e7ca530a8552d082ced92ca8c2ec561fd4e329d3be1a84622da4a54d09

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