Malicious PDF — malware analysis report

Static analysis result for SHA-256 7251faf72ff11f99…

MALICIOUS

PDF

76.1 KB Created: 2021-02-20 00:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dd4f543b28519df51626e78c2fb8a8b1 SHA-1: aa4501e3ece55bc9d9a6b2d9e79685855eea58a2 SHA-256: 7251faf72ff11f99471b0b1d4408d37a724b33bb15cda7fabd99d6208edc3ec8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jottigo.ru/strik?utm_term=cloud+atlas+cast+transformations PDF link annotation
    • http://iranomics.com/the_dictator_netflix_countryddpui.pdfIn PDF document text
    • http://pubggaming.online/92799930627ayk20.pdfIn PDF document text
    • https://zeduwekikozive.weebly.com/uploads/1/3/6/0/136050246/wijovadiriwevaz.pdfIn PDF document text
    • http://yildirimotobursa.com/historia_de_la_contabilidad_electronica_en_mexicov9qks.pdfIn PDF document text
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/jixoberexaka_giwodusekivuvi_sibevutupoki_guxibanot.pdfIn PDF document text
    • http://service-hire.com/883678132771goq8.pdfIn PDF document text
    • http://waystep.site/37307487426a469y.pdfIn PDF document text
    • https://xududegugi.weebly.com/uploads/1/3/1/6/131636960/sinifamajosex.pdfIn PDF document text
    • http://natbeach.space/7697053909448p41.pdfIn PDF document text
    • http://arfesopt.com/802279694025ol37.pdfIn PDF document text
    • http://bigtittybella.com/papez3oub6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/fekum.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/25427211107.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/mesamawinukomix.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/buderus_logamatic_r2107_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/tipos_de_bocio_tiroideo.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_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 5072 bytes
SHA-256: 4644c37ea2c67c99d22a94e47478f8eacba8c55643b9e1691a4a123a3bfb6aff
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 11168 bytes
SHA-256: 9382b8394062ac5b154cb8b5d551c9f35f0a07c63fffdb88327b66a5d8674349

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