Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1a3a347800c308…

MALICIOUS

PDF

309.1 KB Created: 2021-04-02 04:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9567055608731c5ed575f06ea8626830 SHA-1: c951a9f3d2ac3bdec36ee6672f4f3b051d28b5ad SHA-256: 1b1a3a347800c308fcb61c33b7e6b7a3cce7e9f1af335ffad19f88845643c0da
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO UTM redirector link used for phishing, pointing to a suspicious URL. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no executable scripts were found, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing page or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9519

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://fokemale.ru/award?keyword=cours+et+exercices+d+algorithme+pdf PDF link annotation
    • https://tinabatof.weebly.com/uploads/1/3/0/7/130776088/6014345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371246/normal_600018d528664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_600dedca2ad19.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/delawel.pdfIn PDF document text
    • http://copyrighthelp.info/goreva4otsz.pdfIn PDF document text
    • http://ruregere.sportsontheweb.net/year_1_phonics_worksheets.pdfIn PDF document text
    • http://bupitubegedew.getenjoyment.net/gowufuwo.pdfIn PDF document text
    • http://bobixina.getenjoyment.net/xujebug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_60091ac007899.pdfIn PDF document text
    • http://dorutote.scienceontheweb.net/99969381980.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/36239313820.pdfIn PDF document text
    • http://ru-1.casa/gixufukiwivaxodaj6qxgv.pdfIn PDF document text
    • http://makedctl.site/67037694022lpwts.pdfIn PDF document text
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/kigubowi.pdfIn PDF document text
    • https://sugulone.weebly.com/uploads/1/3/2/7/132740418/xamunaliwuvatu_jorananivipuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_5fe50e4666281.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/aa9b75c7-0310-46cd-9c42-4ae9b584e992/87854612480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd72487-2a0d-4507-8e73-a1e779032d10/98748315790.pdfIn PDF document text
    • http://bepolujogox.atwebpages.com/anemias_en_pediatria.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/13900970587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bda703-ef79-4dd7-b073-4e1b60ec694c/ao_smith_promax_water_heater_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c40aa5e-7e3d-41fe-ac1b-b68a2119b70a/antigone_by_sophocles_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76b37fc-885d-4052-8dc1-6e4aae4c58cc/4_pics_1_word_level_2615.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_off000482d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x482D6 5540 bytes
SHA-256: a5170eef44cc5e99fe50c9c5166e7442812bbf3fcd7bdc31e2e964342db4a05e
font_01_sfnt_off00049585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49585 14372 bytes
SHA-256: 35b2e27e91f5b675598501bf8f6b8d25bc8b17f199e0e736467dd2bc89e1d290

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