Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ac8be6f288556a…

MALICIOUS

PDF

73.9 KB Created: 2021-04-23 16:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9b15b2f29d58c3f6db3d8746621deb03 SHA-1: 2001999f6f9934ffde45a4494154c6094d48c323 SHA-256: 90ac8be6f288556acd9a5456cd238692869ad2cec065e5591518ce8a0aacd6fd
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure related to drawing, which redirects to a suspicious URL. This URL is identified as an SEO redirector, commonly used in phishing campaigns to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=how+to+draw+a+cute+cat+girl+easy PDF link annotation
    • http://zusagukitu.mywebcommunity.org/xikuzuzoriluvisip.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/42350918955.pdfIn PDF document text
    • https://xijuxesipokufi.weebly.com/uploads/1/3/4/0/134042605/7152cafcaec6.pdfIn PDF document text
    • https://jalipixax.weebly.com/uploads/1/3/4/3/134340191/vuxetakajevosibejow.pdfIn PDF document text
    • https://tumuzisokume.weebly.com/uploads/1/3/5/3/135351536/b1a18cc3ba5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5fe2cbcd100c3.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/929738.pdfIn PDF document text
    • https://pebetojakudasud.weebly.com/uploads/1/3/4/8/134879391/vulasakizuromotu.pdfIn PDF document text
    • http://rewokujow.scienceontheweb.net/certificate_of_compliance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_606ae7c469d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_60291a13678ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416935/normal_5fff51c932c79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/latufenaw/rulorapovolonomerivod.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/danabepatewamujigalifogem.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/casio_mtg_900_band.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/out_of_office_message_template_business_trip.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/forisinigisuwovej.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/21300411017.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/91217727038.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/44241140537.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5260 bytes
SHA-256: 5316342b1796027cd823a37e92949189c6b7e63e5899f5cb193487f12d42222b
font_01_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 9824 bytes
SHA-256: 924f33810db7ddedfe14cfc840536a2c61fb642d11144b81aa5f305a64767a29

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