Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec001552e64f2bfa…

MALICIOUS

PDF

98.6 KB Created: 2021-03-28 04:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 38b785e7d3a41ebaa318f96b120acfc6 SHA-1: 2268eefe80736044cba98b10cdde37899d69d518 SHA-256: ec001552e64f2bfac951f52a1aa38c69fb974142656791cb61942e36bc01c146
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to 'chicken brooder plans' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=chicken+brooder+plans+pdf PDF link annotation
    • https://cdn.sqhk.co/gorisaburo/hbVLid2/33947862585.pdfIn PDF document text
    • http://lavka-karamel.ru/19585281309se03c.pdfIn PDF document text
    • http://usesalle.xyz/69407962740fha9u.pdfIn PDF document text
    • http://domavera.ru/can_i_have_my_own_router_with_fiosc2sko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470405/normal_5ff1549be6db6.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/sikazomagefolezisata.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/kudatamilawatibosokot.pdfIn PDF document text
    • https://cdn.sqhk.co/nodomepe/ihav4jh/9697426910.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/ar_15_upper_with_carry_handle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_600f15761c672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_604acf902c873.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/witox.pdfIn PDF document text
    • http://lishop.site/does_samsung_tablet_use_windowsztg47.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/lirofisu.pdfIn PDF document text
    • http://bukuxojunuz.mypressonline.com/airway_assessment_anesthesia.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/46759577707.pdfIn PDF document text
    • http://risonubokedoxav.scienceontheweb.net/what_are_the_chapters_in_inorganic_chemistry.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/how_to_do_hesss_law.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_6035b47ac418e.pdfIn PDF document text
    • https://cdn.sqhk.co/vidoperife/irbU1t1/tulumigiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_5fddda8c2a34c.pdfIn PDF document text
    • http://stonersfranchise.com/78317352982iical.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japamitafixe.myartsonline.com/how_to_get_throw_up_out_of_clothes.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/working_memory_in_the_classroom.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/jogajatifokinuxewonidikoz.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_off00013ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 5352 bytes
SHA-256: a4137cc2161c67c5ce0ca3c9fd9f442a6cd72ccd47562c59d6ae7a7125441c73
font_01_sfnt_off00014ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE3 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00015571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15571 11340 bytes
SHA-256: ad7b4b25b61c3a2a2e3845bddc6d88c2eb8903b7f598ad0dce2435212c63f437

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