Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c79af41528dbaa…

MALICIOUS

PDF

74.0 KB Created: 2021-06-03 05:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fbfaf02a38cccbb036b4151d04970f2f SHA-1: 7826f41a6d33dafe990a01d866d1a531869ffc8e SHA-256: 38c79af41528dbaa125f67c2462bd5357a4d1cb5c6e516375d3e2d8be86167f4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'crossword answers', suggesting a lure. The presence of numerous external URIs, including one pointing to 'crysiq.ru', strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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://crysiq.ru/pbw?utm_term=realidades+2+capitulo+4a-8+crossword+answers+page+74 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368229/normal_600323e81b6ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485570/normal_5ff88eb8d26a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370280/normal_5ffcaa920aec5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_5fee93055060d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388060/normal_5fde715d33b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_5fe8005e84b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_604818555ee96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5fd97d4fa2a82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravowibosu.pbworks.com/w/file/fetch/144443223/72126095923.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/2.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144424029/finding_fractions_of_amounts_worksheets_ks2.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144536454/61109783691.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144488172/56747467647.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144443427/ruziwilofakumomifivoxib.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144412542/lusaboxodawitima.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/f/download_harvest_moon_fomt_bahasa_indonesia_gba.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144499824/kadowodiv.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_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 5868 bytes
SHA-256: 2d6372a68170f5dcb835771c70e694b6790eabc94a028e3bfd41df252213b725
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 13232 bytes
SHA-256: 945a27d725b6ce69731e6361aadead87822eaf36dbf5653d7d815095ad76bfb8

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