Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23c25312b6ee92b…

MALICIOUS

PDF

80.0 KB Created: 2021-04-23 02:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0fce3e8c7674df045d91b730422dfbca SHA-1: ee4381eb2cbb0cdb766c51e2033d575278324706 SHA-256: e23c25312b6ee92bc449aa8282d61765fc74f92a40fd4f87a6367094a8786106
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the document's structure indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://pelibifir.ru/strik?utm_term=ross+carbonite+ultra+dashboard PDF link annotation
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/kifedekidamagega.pdfIn PDF document text
    • http://opt05.ru/jko_combating_trafficking_in_persons_pretest_answersumaz4.pdfIn PDF document text
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/8191960.pdfIn PDF document text
    • http://mewajofoguwuz.iblogger.org/what_does_asma_ul_husna_mean.pdfIn PDF document text
    • http://9gusevshop.website/3d_photo_editor_appz2vo4.pdfIn PDF document text
    • https://sawuvuvexefiz.weebly.com/uploads/1/3/5/9/135964560/5769689.pdfIn PDF document text
    • https://fuvutefimege.weebly.com/uploads/1/3/1/4/131453053/4bffb8d263e.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/novide.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/81054749901ict3j.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/6691971.pdfIn PDF document text
    • https://tefitosuwit.weebly.com/uploads/1/3/4/4/134478986/tisirimakofizeseriwe.pdfIn PDF document text
    • http://wovegibexakebof.iblogger.org/rufabolin.pdfIn PDF document text
    • https://pinuzika.weebly.com/uploads/1/3/4/6/134640149/kiregevok-bosuwizolog.pdfIn PDF document text
    • http://tugejavutot.22web.org/aldi_application.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/fawidajapagag.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/5cb2eadb7bb719.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/1969530.pdfIn PDF document text
    • https://zufavaxevonek.weebly.com/uploads/1/3/0/9/130969036/5966686.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jevopuvejamiv.epizy.com/20091504693.pdfIn PDF document text
    • http://mixalibomibu.epizy.com/sensory_integration_and_praxis_tests.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_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 5176 bytes
SHA-256: fdc085237a26c727930d7c4f74bfa1b087d009ed4ffa721675a0c541968a53dd
font_01_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 12248 bytes
SHA-256: d6653e9d7bddd5b6b67b3f5d52aac4c3b66431e526e4bd6a3ea08d6ebecb0a16

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