Malicious PDF — malware analysis report

Static analysis result for SHA-256 39edd29ab07d1eea…

MALICIOUS

PDF

63.5 KB Created: 2021-02-14 01:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cbe19b3fd7bb4fc9c189bfa8bdff79ea SHA-1: 881b404fce3e91629794aed6b8842d31d3419aec SHA-256: 39edd29ab07d1eeac2a70dabb009848db4fa2492eeffb9545fedfe1507a03152
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=la+fitness+brooklyn+ohio PDF link annotation
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/3311aba.pdfIn PDF document text
    • https://zimekepipo.weebly.com/uploads/1/3/5/3/135351260/5093397.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/fb5463162268c.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/nabujuserova.pdfIn PDF document text
    • http://reliables.ru/lerenuxisikefipujigeduly9ahq.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/208059.pdfIn PDF document text
    • http://hookup673.site/46443492619s88mo.pdfIn PDF document text
    • http://teaapple.space/android_file_transfer_pc_bluetoothvgcc2.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/wugin.pdfIn PDF document text
    • http://9gusevshop.space/free_halloween_flyer_templates_photoshopoyd4s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471095/normal_5ff96ce84ce4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_601e5c91d9823.pdfIn PDF document text
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/budasadugomegaxexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_5fdb21d04a96a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5fc794bfa8be6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magakawigola.epizy.com/probation_evaluation_form_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/document_pisciculture.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_off0000bcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDE 5100 bytes
SHA-256: 61a663b2d6fcb99e7518e2c4eac104504a754319eef6f791624a410fdbb8c003
font_01_sfnt_off0000ce42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE42 10264 bytes
SHA-256: d04812f768b057c136fe9daf590c23e1570eb7a0d19d20e0fa07b5c69f245211

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