Malicious PDF — malware analysis report

Static analysis result for SHA-256 269a393db25625bc…

MALICIOUS

PDF

83.4 KB Created: 2021-05-11 11:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0e66476679992d4b0973348470deefff SHA-1: abbec0db53d2e86246ac4f352e56b19af99617c9 SHA-256: 269a393db25625bc64c35db5d95a397f2188eca41b62d0d1e95e412efe3538e9
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure, suggesting a potential phishing or malware distribution vector. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=balancing+equations+worksheet+answer+key+1-10 In PDF document text
    • http://cashbackmoney.info/how_do_you_make_pizza_dough_from_scratchcfhtv.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/tufapomogizu.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/4575000.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/9295262.pdfIn PDF document text
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/8619743.pdfIn PDF document text
    • http://disconto50.pro/lista_de_verbos_regulares_en_espaol_y_inglesswc0z.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/92268869170.pdfIn PDF document text
    • http://disclosures.space/8091682549316c29.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/leucocytozoonosis_pada_unggasfj8z2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_dc82ef8b42ae4764ab6ecda70644f979.pdf?index=trueIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/panovawinodit.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/surah_al_waqiah_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1308b3c3-d9f3-4066-ae18-c2d5dbc2151d/37311006352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764a0bef-1e7a-4969-af71-00de0b1ce36c/xiwavafekajapivuxuka.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_2fc19975a7084aae89d2defd72f55a24.pdf?index=trueIn PDF document text
    • http://supajiwa.myartsonline.com/rozadup.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_a7c3f6bdca7c4e04bdae268382db9789.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_e9e38cedb4ef4f54886557659188dd52.pdf?index=trueIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_ae0969828ef7430babc1630e79beceaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/218c9b02-012e-4ce6-82f4-88d5c24dd515/motorola_cls1410_programming_manual.pdfIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_1aa136453c8f4e90a3943133247349b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dad252a-436f-402d-9a16-bfaacbf0fff9/estudio_de_factibilidad_de_un_proyecto_de_construccin_excel.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_59763319d3144b26be03110286594ee4.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_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 5720 bytes
SHA-256: 05855b14aa25faabbb416ddb1798d39de2f76a9dfa22b16e7bcbacfead6e29b7
font_01_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 11864 bytes
SHA-256: 424c03c482ce7d8ff7615aa82107454fb94f220bc6487571d2a351eb4ab76402