Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bf7e324fcc9ac7…

MALICIOUS

PDF

76.2 KB Created: 2021-02-15 21:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 66374d75dcd1a12c97a7fe844f267792 SHA-1: c07f1a78cdc1014c1c1700fdd1e9f494f4f750a6 SHA-256: 23bf7e324fcc9ac7309601e89ae5d2bc2b2b1afc3e154f3defc097bb13220b3b
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm, with one prominent URL pointing to 'baarspo.ru/strik'. The document body, though heavily obfuscated, contains text related to fixing a Samsung water filter, suggesting a lure. The presence of numerous external links, including one to a potential malware hosting domain, indicates a malicious intent to redirect users. No scripts were extracted, but the PDF structure and external links are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+fix+samsung+water+filter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484359/normal_5ff5a4807bfc6.pdfIn PDF document text
    • https://malotote.weebly.com/uploads/1/3/4/8/134872882/roledesupuxav.pdfIn PDF document text
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/fabopodob-pasadetogezad-zubediberuru-fezijilegules.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/sujomomoxu.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/sidefar.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/bevekizadoxuj/java_6_free_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/angular_4_form_example.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/angle_of_depression_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/silapekeve.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/45180461310.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/reporte_averias_celular_ice.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/lagu_terdiam_sepi_nazia_marwiana_planetlagu.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/bwssb_name_change_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/62864588649.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/76060741433.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/kegopenakurevijijiramivij.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_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 5208 bytes
SHA-256: 64aa9c18fea6cfe2c6f1bd9b827ac8e7fc8eefa07eb16c87c850e160e7366d3c
font_01_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 10152 bytes
SHA-256: 71a5286fbcf67307500f0e754ca96ebf610f1d96e534d8fa2b1dcd8159d73ea4

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