Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfc33d5eb1d20ff…

MALICIOUS

PDF

81.3 KB Created: 2021-04-07 07:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 44750803bfb54acc6caf7ebd0a905bc4 SHA-1: dfe0e37d08b79e76eef20d4598d298c278b8e56b SHA-256: ecfc33d5eb1d20ff2364a58a83ea5aceb143aaaaab750919a9e35e50c9cf1a71
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a high-severity 'Image lure linking to an SEO redirector (free-download phishing)' and a critical ClamAV detection. The primary IOC is a URL that appears to be part of a phishing campaign, likely intended to trick users into downloading further malicious content or providing sensitive information. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=everything+everything+pdf+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fec58b2e14c3.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/vamumexilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409826/normal_5ffb166abfceb.pdfIn PDF document text
    • https://ligenoleka.weebly.com/uploads/1/3/4/4/134496601/9b0dff14da8402f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474449/normal_6002a07deb916.pdfIn PDF document text
    • http://xizapataruxeku.mygamesonline.org/ablandador_de_agua.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_602f109824af4.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/bitinelibar-waseparekur-werew-lelatavigizufu.pdfIn PDF document text
    • https://bisofojud.weebly.com/uploads/1/3/1/6/131607445/resawaguki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_60632e38f09e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_601cb0a638998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446151/normal_5feb0810c651a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_60126d3665962.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/descargar_diccionario_biblico_griego_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_600cbbaeb67eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_8a7a190a2c2645fe909bcd1177806729.pdf?index=trueIn PDF document text
    • http://kimawawasero.onlinewebshop.net/matteo_bandello.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_db90d8e4f88e4f5fa78cc4461fe86750.pdf?index=trueIn PDF document text
    • http://vumamuv.myartsonline.com/genetic_engineering_download.pdfIn PDF document text
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_1fcfada3d3634b0f83d6055106612a22.pdf?index=trueIn 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_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 5032 bytes
SHA-256: be2e8a4239af90606a93d75948314b8d975900d5e422280bf7f6a907c6519a18
font_01_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 11760 bytes
SHA-256: 89be2299a19c38dd65adf5376bc92213455baedeea1b7df24de686aee0537dc4

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