Malicious PDF — malware analysis report

Static analysis result for SHA-256 b100b5f82ad12493…

MALICIOUS

PDF

82.9 KB Created: 2021-03-22 07:34:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e66f356fff20d51efccedca2d3491bbf SHA-1: d41b37391e28498c684f8b3af5d4126a43b809aa SHA-256: b100b5f82ad12493b78b7d0cc2744fb65f8cb74aa08a8f460d4a6b1034ec83b9
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to redirectors and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+the+new+samsung+software+update In PDF document text
    • https://cdn.sqhk.co/kajurineg/ifeAkgh/60515057664.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/gejgA6k/6560884348.pdfIn PDF document text
    • http://characduwe.space/principios_de_administracion_financibct9a.pdfIn PDF document text
    • http://claire-irk.ru/dimpling_tool_sheet_metal2s8xe.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/dTw2SlI/cheap_bucket_list_travel_ideas.pdfIn PDF document text
    • https://zatenumidepav.weebly.com/uploads/1/3/0/7/130776458/6090399.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/8296638.pdfIn PDF document text
    • https://xasufedi.weebly.com/uploads/1/3/4/6/134683860/nikijuwaso.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/fcVFYpp/usar_cabify_en_chile.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/ihhyFSb/space_risk_and_disaster_reduction.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/fgdSge9/dusakarudozukaledivoxa.pdfIn PDF document text
    • http://hookup673.site/81831059981llb38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_5fd3cd364347b.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/gQtiaha/stiletto_nails_extra_long.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6022ca587991a.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/QigjfAV/miss_my_school_days_song_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_601b8ad116aa5.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/RhdKxGs/63450610171.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/bpji3L0/83625919336.pdfIn PDF document text
    • http://liko-sneakers.com/adobe_after_effects_cs5_tutorials_for_beginnerszo0ki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd359808f508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 5408 bytes
SHA-256: 7397cff3aaecbf8a763e3ebd8888e9f0cda5489ac6c165dc3387baccd17135a1
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 10824 bytes
SHA-256: e613d2a52eb498097d52bf02c400d3b419867dfd9673548de30129bac0c00289
font_02_sfnt_off00012fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333