Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa51b6b9ded009c…

MALICIOUS

PDF

69.4 KB Created: 2021-01-21 16:38:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fbf4084a9d0bc8dcc97ce64c7a2a66a7 SHA-1: 921cc4ca1357e7fe75df0aee47428fe6a04522fa SHA-256: 5fa51b6b9ded009cf8dee0c0ba20139d212ddc66c9c4c1f8fc09771f045210c9
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple external URIs, suggesting it may be part of a link farm or phishing campaign. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique to trick users into executing malicious commands. No scripts were extracted, but the presence of external links and the lure suggest the document's primary purpose is to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://seumenha.ru/aws?utm_term=android+browser+simulator+mac PDF link annotation
    • https://cdn.sqhk.co/zufuxirap/VjdJSP2/70531209425.pdfIn PDF document text
    • https://site-1225452.mozfiles.com/files/1225452/31733237728.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/jNtbshd/9655060739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_5fd2878ef399f.pdfIn PDF document text
    • https://cdn.sqhk.co/damapegapi/ihQ1pgl/gain_followers_on_instagram_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/jJjhChe/lg_xboom_go_pk7_watts.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/cnc_machine_in_tamil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowuwivipi.rf.gd/bootstrap-_carousel._js_file.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/swan_neck_deformity_vs_boutonnieres.pdfIn PDF document text
    • http://punegejofuj.epizy.com/rilaravitutixipag.pdfIn PDF document text
    • http://zowipazivavi.epizy.com/46542450212.pdfIn PDF document text
    • http://gagonunanu.epizy.com/aadhaar_card_form_online.pdfIn PDF document text
    • http://luxixeg.epizy.com/logo_quiz_answers_level_18_iphone.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_off0000cf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 5304 bytes
SHA-256: 3ef1749c9e597af421d4083aeb1c6b01e7efd857e2346093c8090999ed032d86
font_01_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 11712 bytes
SHA-256: 38acbd69f332ae256e4aac09fc915d8dfee9347eb42c7fe9bd6931c1dc71bace

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