Malicious PDF — malware analysis report

Static analysis result for SHA-256 c528eecb03e7cef3…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 12:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a41dc18128bbb4c27953c6a33105089a SHA-1: 71c90054a70a821b22b6476100ac81677fd7485d SHA-256: c528eecb03e7cef312a716178b80203350eb2fcefdf1cce497f26df3d0395458
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=strength+of+materials+notes+for+gate+pdf PDF link annotation
    • http://frut-tree.site/dejovajuvokogilofenaaa9y7.pdfIn PDF document text
    • http://lienforkid.com/xerodafamafokod5znb3.pdfIn PDF document text
    • http://hidver.com/different_purposes_for_writing_a_business_planhy1li.pdfIn PDF document text
    • http://digerutejonoju.22web.org/9714787188.pdfIn PDF document text
    • http://vajokopopozikem.medianewsonline.com/66271703007.pdfIn PDF document text
    • http://meetdouche.xyz/how_to_set_the_time_on_my_esi_phone64ciz.pdfIn PDF document text
    • http://kefets.xyz/25094245541ufd6v.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/21557703-9843-43c6-a466-64ad0a828877/tizotu.pdfIn PDF document text
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_2e3d86e3e6714be5892e2b89daff41d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2644af85-acd6-469e-b2ed-d74c215dbc7e/44063147707.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_28f943d8356c4dea9999cf9d67b1bc83.pdf?index=trueIn PDF document text
    • http://dekuravimej.epizy.com/transport_canada_aeronautical_information_manual_tc_aim.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_cf2425f544f84ba99cedb101254f2166.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97cc1c5-977c-4c69-8087-005fb33dbee1/vibagaxekute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7086eda1-082e-485a-a152-3b0636c67ea9/zoligujivofavoto.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_fc85036a386f4941bb44703c094e87e9.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_87436d718e0b4b579b32753bb419bc00.pdf?index=trueIn PDF document text
    • http://jutagejefutix.atwebpages.com/ncert_class_5_maths_practice_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ffeb01-bf8d-4629-ae76-31750102672e/what_does_my_vape_mean_when_it_says_check_atomizer.pdfIn PDF document text
    • http://kotidaw.epizy.com/bulimibuzezagisit.pdfIn PDF document text
    • http://ritekarevo.rf.gd/74413380247.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_df878185225148f7bb3e25de2c76cad1.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_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 5560 bytes
SHA-256: 261a310ed49777f1859cc014491d07a47069cc0b742c9893d39909039a4ee411
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 10544 bytes
SHA-256: fc748453a494efb0f3ba83fba3eedd43be5a04c7081ae10981070901df1d5ab4