Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c361fc3d59aa7d5…

MALICIOUS

PDF

106.0 KB Created: 2021-04-03 11:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d728ee544275ec4c9105a7f1c9d98a35 SHA-1: 10a9173dbe065ca8f487e3613de4883c07edb70e SHA-256: 8c361fc3d59aa7d55a7e9d58ac31086b35327685349406716c6defe95eb1b9fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a deliberate attempt to create a link farm. One of the primary external URIs points to 'https://jumiwimov.ru/123?utm_term=child+wellbeing+and+safety+information+sharing+scheme', which is likely part of a phishing or malware distribution scheme. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=child+wellbeing+and+safety+information+sharing+scheme
    • https://cdn-cms.f-static.net/uploads/4369645/normal_605be7971b699.pdf
    • http://jakufodunod.getenjoyment.net/xifulu.pdf
    • http://zitalogeloluwiw.mygamesonline.org/energia_elica_como_funciona.pdf
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/0ce157e200.pdf
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/8168070.pdf
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/4727425.pdf
    • https://cdn-cms.f-static.net/uploads/4420911/normal_604ece641e6ff.pdf
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/voxiduno_jokomaj_nuzejamuwob_woxefitoxalojip.pdf
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/zugulokudoravu.pdf
    • https://cdn-cms.f-static.net/uploads/4475853/normal_6045fcc2d924b.pdf
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5ff65d2d97c10.pdf
    • https://cdn-cms.f-static.net/uploads/4477892/normal_6021a0480be52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dolojivek.onlinewebshop.net/puwoxapuxeva.pdf
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_38ab8ec2d05c494aad2301c757debb14.pdf?index=true
    • http://xipanizi.myartsonline.com/can_i_use_amazon_echo_as_a_bluetooth_speaker_without_wifi.pdf
    • https://s3.amazonaws.com/rawesaragegugar/mamijupidubenemuratetul.pdf
    • https://s3.amazonaws.com/folexapurilowe/pengertian_pendidikan_agama_islam.pdf
    • https://s3.amazonaws.com/wemupajese/zomepurotijexilakafevob.pdf
    • https://s3.amazonaws.com/xepululejiwof/how_to_set_up_a_timex_marathon_watch.pdf
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_c8df844875414d1f8c8673f1440464e8.pdf?index=true
    • https://s3.amazonaws.com/ratixifo/zevoxomasibudonotaf.pdf
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_03b8ef5b49e042f19bbabb15d1f01052.pdf?index=true
    • https://s3.amazonaws.com/xupovobejanam/pizesanirado.pdf
    • https://4b98dde3-f65d-4e11-807b-d4501949e87b.filesusr.com/ugd/4a7ebd_2a87af06ce1a462a91a393bb29edda59.pdf?index=true
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_248ec1edebf74fe79c9e8cd6b9d97b07.pdf?index=true
    • http://penobugixova.atwebpages.com/definition_of_research_methodology_by_different_authors.pdf
    • https://s3.amazonaws.com/tonisefoteka/85995238398.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153d1.bin
794e852fd13dadb506f528655ee561a3723d967af8a35e0733baf70e2ed39304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153D1 5580 bytes
font_01_sfnt_off000166a9.bin
bfaafc87faff2ad9878b6569d3dc538c04e55838a360dc08e4e1c033e56bafbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166A9 10960 bytes
font_02_sfnt_off00018bb4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB4 4324 bytes

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