Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef4075420a50775…

MALICIOUS

PDF

75.4 KB Created: 2021-02-15 20:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8cb4916805cbdf060f9ed0437cee3821 SHA-1: 8823195e8ef728ddbea8c6e1aa7a0d180a7bb3e3 SHA-256: 6ef4075420a507755b462a72552fff3fdd88f12ec8faad076e51e661ed6220f0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://druttle.ru/strik?utm_term=what+is+corporate+social+responsibility+and+examples PDF link annotation
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/9679a5.pdfIn PDF document text
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/2793093.pdfIn PDF document text
    • http://euroshopmn.space/nobepaxaxunewewajonekeded2hhhj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_601cdcc395bba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409814/normal_60174fda60df0.pdfIn PDF document text
    • https://dijujuvosidig.weebly.com/uploads/1/3/0/8/130873718/vefaxoxowawaro.pdfIn PDF document text
    • http://christinaanddavid2019.com/mxr_chorus_manualix9e2.pdfIn PDF document text
    • https://xuwogojike.weebly.com/uploads/1/3/1/3/131380868/3199515.pdfIn PDF document text
    • http://persequenteamsohbet.com/460792036xuwc2.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/4330015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufufud.epizy.com/zetewovemaxikonani.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/chess_3d_windows_7.pdfIn PDF document text
    • http://rabogefegu.epizy.com/instagram_stories_mrs_meldrum.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/2019_yearly_calendar_with_holidays.pdfIn PDF document text
    • http://xafepabofi.epizy.com/11864452006.pdfIn PDF document text
    • http://sidovarodefomi.rf.gd/docket_sheets_massachusetts.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/plant_pigments_and_photosynthesis_lab_carolina_answers.pdfIn PDF document text
    • http://xumomevafuvozup.rf.gd/paziloruxezaxiweta.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/44605019803.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/ashrae_standard_55-_2004.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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 5636 bytes
SHA-256: cea6aedf90d60db0eb51d8b66d67d91c17e4783ee0506d0291e6d65c0b8254ba
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10484 bytes
SHA-256: f18ac90bb825cb7b1c810a8fdb2601d227cb3a37b8030a9488e0b2c89d1e2d2f

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