Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b837de7018234f…

MALICIOUS

PDF

80.9 KB Created: 2021-03-18 10:13:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 05dd07d01614f0ba7551dfa29421314c SHA-1: edc902eb7c59e659fe1cf4212d52e04808725f77 SHA-256: c2b837de7018234fee1578ae3fd71b204d12dfcf805d7854863305d20ea8615f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malware. The presence of numerous embedded URLs, including one pointing to 'vilenefex.ru', suggests a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the document as a link farm on disposable hosting, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=funny+persuasive+essay+topics+for+high+school+students PDF link annotation
    • http://vetebozo.mypressonline.com/film_genres_list.pdfIn PDF document text
    • http://xasujaru.22web.org/sound_recorder_app_apkpure.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/bernoulli_s_theorem_in_tamil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joduzot.rf.gd/multivariate_statistics_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/legolas_cosplay_guide.pdfIn PDF document text
    • http://jakosorer.epizy.com/zesajituxativujotukome.pdfIn PDF document text
    • http://xofukadebinomo.epizy.com/beginner_violin_pieces.pdfIn PDF document text
    • http://tesubetagavon.epizy.com/how_to_naturally_take_out_ear_wax.pdfIn PDF document text
    • http://porumujowupof.epizy.com/70556076861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4233d7-2d10-4664-b5bf-d097aa2967cf/name_and_describe_three_types_of_intermolecular_forces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1420eaa-29e8-4042-a996-2e82ce359b60/21811530338.pdfIn PDF document text
    • http://sesoxevanadike.epizy.com/call_of_duty_android_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/zutunizesuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b99fc7-e266-4653-add7-40328170b92e/a_literature_review.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_199da9825a574888abdb0b1722919ca7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizabo/invitation_size_envelope_template.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_f52a1a1265364103b1aa7d61f17c5d89.pdf?index=trueIn 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_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 5536 bytes
SHA-256: 30729006441379e8d3146b0d8d08ffe27b154fecba0558cacbd805fd1edb8124
font_01_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 10480 bytes
SHA-256: fe4e66c614f3011f30986ec2d0bc73e351c7e4fc7889a9118f8ddf3ae8924217

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