Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81d2500024c524f…

MALICIOUS

PDF

77.7 KB Created: 2021-05-14 14:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e13586c2fda49f02c72682e613155354 SHA-1: 281b2e4f9446243f50538a9c0f11a01d24040826 SHA-256: c81d2500024c524f59e428a2ea223dea8fa0f077fa6270e597e35ce6110a1f92
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document body, though partially corrupted, contains a lure related to 'autism spectrum disorder' and embeds multiple external URIs, including one pointing to 'dugedepap.ru'. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://dugedepap.ru/strik?utm_term=how+to+help+my+child+with+autism+spectrum+disorder PDF link annotation
    • http://xupelomepole.22web.org/navelupuzelimejubowugori.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/el_pollo_loco_chicken_leg_no_skin_calories.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/42344905687.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/general_anesthesia_medicinal_chemistry.pdfIn PDF document text
    • http://kenufapozij.22web.org/98821935082.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/anomalias_dentales_de_numero.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/xodotozeduxikona.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/2203dddf-d506-48eb-a9ef-791889fa12be/kofovuzabuxavomogoxupada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e52d3580-7831-44d7-85b5-9d2d8ee0cbd5/13130368060.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_577edd488142450780e6d82c297eed8f.pdf?index=trueIn PDF document text
    • https://7054f9d6-44ea-4b6c-8535-0d04e7cb9957.filesusr.com/ugd/963b03_9c9d8a4d55b941f0959e9f4de3366829.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83199f92-8169-4fef-9c3d-b2a61473f855/pamelipasijope.pdfIn PDF document text
    • http://wisijogasego.epizy.com/general_awareness_book_by_arihant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bed422-8260-40fe-b84f-c278e31d57ca/vegakogiw.pdfIn PDF document text
    • http://pixafur.atwebpages.com/icao_annex_14_8th_edition.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_791f659c2d3c452a96c037b36a7a0fa5.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_d5ae016fd09f48e1bf93a24a5dfc4ee6.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_e542f78c26f448728928925750e02265.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7b3b1c-4553-497b-898d-8e2ef58afd67/18516924974.pdfIn PDF document text
    • http://bidedunojinepu.epizy.com/banting_diet_recipe_book_download.pdfIn PDF document text
    • http://muvamubas.atwebpages.com/master_sanitary_fittings_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766f7ef8-a953-444c-b725-5e71a44c93ec/kekopaximudit.pdfIn PDF document text
    • http://vodulisus.rf.gd/afrocentric_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39665703-f994-4f78-839a-05bfa7aee630/jazalewe.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_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5468 bytes
SHA-256: 6852e9d77cfc9c12b7c6af8d93d2ef5f4405758fb31fafc8e5316627b8cd319b
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 10604 bytes
SHA-256: 62e1c420915ac7cec1a63800b24820c90d4e4a26e48ff127776b141f1edee1e5