Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8f14d547e66d60…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 17:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d952d39947a83a20cc9d8b92ee506ca SHA-1: 570c926f9e8fef7b5bd777afa6d3129ec2ccf71a SHA-256: 5f8f14d547e66d60e5835fd6faf929dd860cd92b08114b731aa7a3fc9b38210c
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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/strik?utm_term=cara+mengatasi+operating+system+not+found+acer+v5-132 PDF link annotation
    • http://gonalotuturopil.mywebcommunity.org/vezatajuguvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_600dcf7f1ac4f.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/ms_excel_functions_for_accounting.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/kigitufaxoduzed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368777/normal_5fdd3800a0750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372080/normal_5ff0778489664.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/rupukopapofebofoximorute.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/wusimedili.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/31968659504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fd9bbf421259.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/puded.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5fec03c4cd1a9.pdfIn PDF document text
    • https://kivojiwivumupu.weebly.com/uploads/1/3/4/5/134597008/jikiwuxojoja.pdfIn PDF document text
    • https://rebenanutizoder.weebly.com/uploads/1/3/4/7/134752372/b4ff4a207d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403689/normal_6005e815c33d4.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/d83149eb3488.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_7a2483bb3c504b5aada33c8599bd5cf8.pdf?index=trueIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/japanese_verb_dictionary.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_06fbcbe7ef55405081f500c7ac537b2f.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_ca9fdbd6349c449cadb8a5a9a6d63a0e.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_159bfe20f1d445548f24484da3139096.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_074f46f89b5044dead7ef11655b83607.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/11262368891.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_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 6012 bytes
SHA-256: ab67cc5e7d752545677ffe7e940c59c99e42298a11be38bfb9ae4b195f6f0912
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 10684 bytes
SHA-256: 167f88dd26503e1213cc8dfc44ee59dacadf3c1d7b38dfaf21186e56a66b084b