Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe5b1bb3053a45d…

MALICIOUS

PDF

87.9 KB Created: 2021-03-23 15:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 392c4944a174d12709800583e06f098e SHA-1: a7ee86c09248efc0e7ab872fa0df9beb89441ca9 SHA-256: 1fe5b1bb3053a45df17d1357330dcdbc5d779ee10ac419918174742ed2a5765b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs point to sites that may host malicious content or redirect to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/wix?keyword=sadlier+vocabulary+workshop+level+g+unit+2+answers PDF link annotation
    • https://zatenumidepav.weebly.com/uploads/1/3/0/7/130776458/govolibif.pdfIn PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/xopide.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/hbjbgfT/factory_for_avatar.pdfIn PDF document text
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/0ea6e0623c8d1.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/7160426.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/ijGzi9e/nunolane.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/ifjiFgd/1392072458.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/jesase.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/6hiPjbo/zekunimetitegeta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_f5438df0f0024b57a8332bca6106f985.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetevali/vepiwanadogesiwaz.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/rokisev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1b75cb-38e2-497c-99d4-38b0169c0b22/vojowemeziku.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_c31199d062d84501b2dc238034eb018a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30afe72d-d8b4-4170-b804-c6e63ca9f9ce/o_level_biology_topical_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f491939b-71e8-4b90-90e4-8a546adfca90/tivogelisidir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10548a2-14f6-4159-acf6-1f9573cd29e9/13033080984.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/dwarf_fortress_best_graphics_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769cdd65-50cb-40c1-a278-7ff1497e6b86/veropiwodexaxiroso.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/34663850687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1e8b7d-3c7b-4f20-855d-56a38334a03b/how_to_draw_realistic_eyes_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a49b28d-680e-40ad-938a-a2252946ca15/pdf_preview_handler_download_outlook_2010.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_bd1f3695b4dd40a184b154b36e160f7a.pdf?index=trueIn 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_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off000116ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EC 6028 bytes
SHA-256: ab3219b42d207b63c2ae4468e9cffc26e52d8963cd1260fc831d8c381567f882
font_02_sfnt_off00012b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B85 11108 bytes
SHA-256: e036d8091961831e87dd86a5d92fd8e1cd7925a6dc27c6db7ab0344f56fdf3f9

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