Malicious PDF — malware analysis report

Static analysis result for SHA-256 7485710b0c501372…

MALICIOUS

PDF

73.0 KB Created: 2021-03-25 16:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e64551b64d0f8836b62395306fcd4718 SHA-1: 21c4e508febad46ba8a4395d99ae1923adf44413 SHA-256: 7485710b0c5013720db8db77ff81d86b1742a23305807e614e8ad39b00c27459
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=epidemiologia+cl%25C3%25ADnica+fletcher+pdf+download PDF link annotation
    • https://cdn.sqhk.co/bumogebiz/fgfmLzD/65047245046.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/b670388f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445881/normal_5fcb566d01385.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/tinirofumudefovimezer.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/lagalifuzonefe_biropo_zojow_fozagagaparex.pdfIn PDF document text
    • https://risibazizugati.weebly.com/uploads/1/3/4/7/134710005/povomutetojadi.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/9032793.pdfIn PDF document text
    • https://cdn.sqhk.co/zekoparan/bgeuDjh/sijilojoroladifuwidij.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/Ahfjbjb/vexations_erik_satie_sheet_music.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/3114608.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/english_test_with_answers.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/allen_key_notes_homoeopathy.pdfIn PDF document text
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/fakufem-dimag-kavunezawoso.pdfIn PDF document text
    • https://narofuputukate.weebly.com/uploads/1/3/4/5/134585455/sipuwarifixen.pdfIn PDF document text
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/nagasilexotumag-nasodakef-wiferu.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/f9e492d.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/244296.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/jbjgibM/dunkin_donuts_near_me_now_hiring.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_6009d88c6e66c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465707/normal_605a25d452182.pdfIn PDF document text
    • http://bimonetejatoleb.mygamesonline.org/origen_del_genero_narrativo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465142/normal_60089f0418c66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuxabatadifu.onlinewebshop.net/rewazubumiperi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d786875a-b726-4889-ad10-d52f771ab136/30669336865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da819a1f-cd50-4ff3-b1e8-dca9e813c8b8/how_much_do_district_attorneys_make_in_los_angeles.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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 5496 bytes
SHA-256: 9df99a6e71643cf0ce58fde6248c52c2b792f40954a1c44ba3091867f32d5eeb
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 13192 bytes
SHA-256: ff51c91d1af2fd23b035c7c4e5b1fa206ac167a7c2d7b7af2be537eb31bef19c

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