Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65c5cfc6d6e13f3…

MALICIOUS

PDF

80.3 KB Created: 2021-06-13 08:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 97304b6a4ecab8477de57f53a658fecd SHA-1: de3b0bee369e1f1052bd60de95387aa25e007508 SHA-256: b65c5cfc6d6e13f3df6a8147de115c14a25ab199477931047eaf122ed8bb033e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a domain associated with phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://allytemp.ru/pbw?utm_term=health+and+wellness+quiz+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405413/normal_604a8f00d6d70.pdfIn PDF document text
    • https://vatizojisizekig.weebly.com/uploads/1/3/4/8/134852150/0c0cec16f0de.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4444095/normal_60b2b6290e02f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5ffc4810dab04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_605924cc4f1eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_601113f36a47a.pdfIn PDF document text
    • https://melokiziw.weebly.com/uploads/1/3/4/6/134669089/tesokutewuxi.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/dedapokanofoze-jadagosum-mutado-kukovuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_60485e40223bc.pdfIn PDF document text
    • https://bolafuba.weebly.com/uploads/1/3/4/6/134668532/datonipejawaladijoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_60276ede8fead.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5fc9a7f08247c.pdfIn PDF document text
    • https://xigefazevape.weebly.com/uploads/1/3/4/6/134632801/wozufusopifuxokot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_60296c79987ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_60067fa031745.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://nomebazeregi.pbworks.com/w/file/fetch/144717525/free_download_pro_evolution_soccer_2008_full_game_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266f0df9-84a3-4f47-8397-cc1db93d620b/55226495680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c82f7d-891b-434d-9c4e-45dc8f60b0d6/vibukodenixos.pdfIn PDF document text
    • http://lifevuve.pbworks.com/f/30151439349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749aa337-4794-47c8-b6c6-915ed5f68bdc/capresso_espresso_machine_user_manual.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/42209852700.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_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 5240 bytes
SHA-256: 6e882ce8feb602172579678d1254900da44232b8406fd1c4eb85c602b9209a22
font_01_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 11256 bytes
SHA-256: d95add5781fc12a63e4d03bdbf1c12c737fe26939c9870bbe01c4b75241a1091
font_02_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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