Malicious PDF — malware analysis report

Static analysis result for SHA-256 76897e35dbfdd03e…

MALICIOUS

PDF

70.2 KB Created: 2021-02-18 01:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d35616967a458bd956e2c8adfcbbe71a SHA-1: d2c75ab872587bcb8cf42e291fdc57edc81ec083 SHA-256: 76897e35dbfdd03e4d3b034dd84bfbe5028129bd578b4deb55506358609b6ee4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. It contains a large number of embedded URLs, many pointing to disposable domains, presented as a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'firmware update' for a D-Link device, aiming to trick users into clicking malicious links. The presence of external URIs and the link farm structure strongly suggest an attempt to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=d%2527link+dcs-5222lb1+firmware+update PDF link annotation
    • http://megatorg.ru/lafomem7laz.pdfIn PDF document text
    • http://terem.space/zirafosubonaduwarodwb1oc.pdfIn PDF document text
    • http://civiliscmq.online/wings_of_fire_book_154tc61.pdfIn PDF document text
    • http://tryraisins.club/real_python_booko43rv.pdfIn PDF document text
    • http://dabutaxezopis.iblogger.org/89787224887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467274/normal_5fdab321c3ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_602da2c00cd30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386333/normal_5fe173b5b572e.pdfIn PDF document text
    • http://cmbclientes.com/woxokikexupe1gl8n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5ff76cc0d30e9.pdfIn PDF document text
    • http://storeyou.store/68328111500wzyeo.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/perurulexi/37870034138.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/radipexexe.pdfIn PDF document text
    • http://wupotolirenenar.epizy.com/accidentally_in_love_drama_eng_sub.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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 5968 bytes
SHA-256: d6745c09bbd3472020aa0678a7bea7eb2defb32b9a2178de9ad0c0e794f62f78
font_01_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 11280 bytes
SHA-256: 838c9269a8e051a0f110af05b50be315e47d5ec77cf4c0d1f7a6aa538e3a3bb8

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