Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c93565dba37f7f…

MALICIOUS

PDF

69.8 KB Created: 2021-04-17 05:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bf548942feed621f0ee78bf584ddb62a SHA-1: 693e6782e70ce6735d9eee60c566f545eb85a559 SHA-256: c3c93565dba37f7fd6dffb3a4e3758c123fe77284442356d5cd55c3be9a2e0e8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=the+standard+apartments+fort+collins+co PDF link annotation
    • https://cdn.sqhk.co/vigesiji/aRSgdPm/13980807474.pdfIn PDF document text
    • https://cdn.sqhk.co/nunexijezep/bghTb9B/88680156344.pdfIn PDF document text
    • http://shoes-storie.club/sunbeam_bread_machine_instructionssutb0.pdfIn PDF document text
    • http://mmmmmme.space/321301261169yurv.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/gfYDhjS/xugozujesipibetivad.pdfIn PDF document text
    • http://kamaz-ftc.com/C3BCC3A7_dC3B6rt_beC59F_yayC4B1nlarC4B1_ygs_matematik_soru_bankasC4B1_indirwppjs.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/hfDfH5q/10077883387.pdfIn PDF document text
    • http://vienvozvrat.site/veruxafuf3ffc7.pdfIn PDF document text
    • https://cdn.sqhk.co/sesekopusoj/hhim1rY/9703758619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_5a07964bac2e47ebbc4d5262db19f055.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/73302139495.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_abaca37509394487ae4aed06fefbe067.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/zajatox.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/16403187623.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/25203578546.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/lijaguvazema.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/51776200682.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_7192eb73a8a04fd6bd541d084085f8dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/python_format_sql_results.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 5344 bytes
SHA-256: 4a1f1c7a4abebfceda2bd9d151b20c9e0e91dc4137a1124230a274a02d4d40f0
font_01_sfnt_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 1964 bytes
SHA-256: fa2dc2bc9bbdb96b86f480e8bbea6b8b13dce6b37e62a22236e6e32dffd6dbf0
font_02_sfnt_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 10568 bytes
SHA-256: 5c627bf485a182f1e148fa701297280c3aa616d86c4aa80bbf6df0fc53cb32b4

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