Malicious PDF — malware analysis report

Static analysis result for SHA-256 33719934f4c82f68…

MALICIOUS

PDF

77.8 KB Created: 2021-05-18 17:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 08610a8710c89684a46f151e7572a0ba SHA-1: 0519c409f69d4c38e54f68903ce79806a6f1f289 SHA-256: 33719934f4c82f68c62119d094c741cedd6d308dffca175b81e6132459991a47
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, with two identified as potentially malicious, including one that appears to be a redirector for search engine terms. The document body, though heavily obfuscated, contains text related to medical tests, suggesting a lure to trick users into visiting these 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://vilenefex.ru/strik?utm_term=what+does+afp+blood+test+mean PDF link annotation
    • http://jifixadilo.22web.org/new_year_s_resolutions_list_template.pdfIn PDF document text
    • https://sonazunug.weebly.com/uploads/1/3/4/0/134012513/vagominawipu_zerubos_puzoziw_nupimetuzoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fe7f430a1caa.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/f3b0656b1cc5a8.pdfIn PDF document text
    • http://falupopakiwowe.22web.org/arithmetic_progression_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_6064b7e469075.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/7187427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375352/normal_5ff4f168535cf.pdfIn PDF document text
    • https://paterixif.weebly.com/uploads/1/3/1/4/131454766/basen.pdfIn PDF document text
    • https://tesewipelevifiv.weebly.com/uploads/1/3/3/9/133997178/1912214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_6039d5b6a1346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6036d3932a139.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/vovabagubajegeb/jakifunaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144f6f0f-2b73-49b6-bcb3-f4e9ccb4e18d/essay_writing_topics_for_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/yakuza_0_walkthrough_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7895bd0-151d-4cf4-9a9f-d8f304f7bb8b/gevomalimenapusuxipalimel.pdfIn PDF document text
    • http://xufeguwopox.rf.gd/adsorcion_fisica_y_quimica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f944c475-7d61-437e-975d-b61fc58c2055/furenuro.pdfIn PDF document text
    • http://tufozule.rf.gd/75718647475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836569c8-3525-434f-b0fa-311019e5a487/wukuka.pdfIn PDF document text
    • http://dosegetutep.rf.gd/10th_maths_guide_tamil_medium_free_download.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_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 5336 bytes
SHA-256: a8e27fdf29fa238aeaa15130947ed9e56771c68dd8871012a9798004fa9f8882
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10516 bytes
SHA-256: f7b3e279629114928cd5470defbc2345f380618ff70f8c33d6e21b0c19504bde

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