Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fd8df79c78cd7f…

MALICIOUS

PDF

80.1 KB Created: 2021-06-01 12:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cbd6310a703697df3ecdf291c8afe8d9 SHA-1: 10343b512282a593635f1fd1f42bf36cbfe77703 SHA-256: 15fd8df79c78cd7f7275d26a422ed388fdf12b72cacee47ecc597ca8c12c94e1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crysiq.ru/pbw?utm_term=hp+probook+450+g5+battery+reset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473030/normal_5fea34838eae4.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/tiwekogejenurali.pdfIn PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/letal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467005/normal_5fcc46d0b6945.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://jijagenaneke.pbworks.com/f/mozakitedipafuxonuzurema.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144427845/tifalutudizamiwe.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144427128/gazerez.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/90988294898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4115b2-4192-461e-9deb-3b8c077376d9/10549452898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbd98b8-7348-48cc-bfa0-f86aa134dd4c/prowlers_and_paragons_ultimate_edition.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/vugajorevanase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0aa267-fccb-4af2-9a7b-9aa1489ebedb/how_to_use_credit_memo_in_sap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/166a3348-f6e8-47ef-8108-8631aa07abf0/zuvujukerepozebiziwivon.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/kitafavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e06337f-062a-4958-9590-c2c0b64ecd5a/mosebudiso.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/why_is_my_direct_wire_smoke_detector_beeping.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144413265/75249121843.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144420369/vudosav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5394f2d-5ce4-43af-bbaf-555f1ad02315/1165740998.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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 5208 bytes
SHA-256: b25ed19ac591d667e99c8d5cd8277950852ddbe509a8afbc35c6ec1f5c7c9e1f
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10336 bytes
SHA-256: 921d3416b55d1d9440d115f1b73547d8126a622f698802e4d4100fab59b68c2b
font_02_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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