Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e3a9a61521f086…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 20:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1789080082c509063425e6f902584adb SHA-1: f3763f7d84733fed81c44bb729a6d7ebc5561564 SHA-256: 66e3a9a61521f086ff71fd75d1b296f3bddd28f0a2711db7b9d2ecd23013e3a2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to phishing sites or download further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=definition+of+financial+analysis+pdf PDF link annotation
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/a7c3dc52.pdfIn PDF document text
    • http://vitrinachel.ru/mulonafepifj5r1j.pdfIn PDF document text
    • http://winoraama.website/undyne_fight_simulatormabn8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_60493dff96969.pdfIn PDF document text
    • https://cdn.sqhk.co/polopomoset/jgOhfJJ/77448429166.pdfIn PDF document text
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/lawoboxox_gexekoluxubus_sinebero.pdfIn PDF document text
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/lumunisodure.pdfIn PDF document text
    • https://jomagikovire.weebly.com/uploads/1/3/1/4/131408086/351547.pdfIn PDF document text
    • https://pofubelepegeva.weebly.com/uploads/1/3/0/7/130776421/lomef.pdfIn PDF document text
    • https://bigubuwona.weebly.com/uploads/1/3/4/3/134309174/deboj_xoluguluragip_zikipebapazusi.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/0DQX0jb/dusemuxopaxusixojuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/zawumelapo/iFulRcU/curvic_coupling_dimension_sheet_explanations.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/jcD8jgk/defender_90_soft_top_conversion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_6039643b7333d.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/tarigodedemegizidifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7b839e-71c4-4b45-80a5-6f92d969e597/balifaligapuvavokuwuronex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3f4da0-f300-42b5-a6aa-6238f3ee7f37/zepanavofani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5428da21-a885-42dc-9da6-7687ca444f0a/sinoraxisefimuvakenowa.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_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 5156 bytes
SHA-256: 48e119a39bbf1d128872058ad0e78cfcea9b6139c990d0073984da1a353bafa3
font_01_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 10788 bytes
SHA-256: df495e2979435e530d6a7e8d83424a037658d9c9dbbf3151ec6754698f347e2f

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