Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ceebf7b7d91acf…

MALICIOUS

PDF

74.5 KB Created: 2021-04-15 22:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1f5e5052da5ae2b78b11e31336ccb1b0 SHA-1: bc95d6c34e435a4020f783340dfab198d3993ebf SHA-256: 81ceebf7b7d91acf6318bfea34c13032f2ce4bb2844811a61ae2d659939bbbff
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or spammy content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=estructura+interna+de+un+texto+informativo PDF link annotation
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/sojutakut.pdfIn PDF document text
    • https://wejuwano.weebly.com/uploads/1/3/1/1/131163718/purazibalat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6034c9c1e6587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_6063ad7446792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_5fd88a0b9e0f7.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/7087373.pdfIn PDF document text
    • https://damenuxorofupob.weebly.com/uploads/1/3/4/7/134711178/9e7260f8b510.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/xakajoziwibi/bolupun.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/how_to_find_a_wife_according_to_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/baywatch_2017_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/how_to_delete_bluetooth_device_from_pioneer_deh-6400bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b88ca83-25b3-43db-afbc-c1bde3981a40/29505777656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bd15f9-1ea2-4b9b-8f06-dddf13f6a5d5/votujusafalefibibanukuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a4b281-5771-439e-a402-a750f0d01e54/monitorear_red_lan_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/12318124492.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/60616008867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b659b2-6d37-41d8-bf49-f3d38286e79b/fender_super_champ_xd_voices_list.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/no_1_businessman_movie_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/53519468167.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/xaperoli.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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 5220 bytes
SHA-256: f75f55a73ab63732facc73826b702a6cfbd41476ff6c0f2e2facce71e6d41ba7
font_01_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 12540 bytes
SHA-256: 868af5fb7490a1f4f53df38a91747605ab69662179c9cfe2b5a65a09d0186f1d

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