Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc518742672a0c4…

MALICIOUS

PDF

77.2 KB Created: 2021-05-17 23:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 70e4359f22bf0d88cef1d2bdd2f9b29b SHA-1: 2d817bb855c0ae9279b056f078e2e9554864c053 SHA-256: fbc518742672a0c4284b22a4f581c1fd4de6e1b7177aaef0b87efa74fdebce56
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, suggests a lure related to creating a professional resume. The presence of external URIs, particularly the one pointing to 'xajibur.ru', strongly indicates a phishing or malware distribution attempt. The PDF structure and embedded content are consistent with a malicious document designed to trick users into visiting a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xajibur.ru/strik?utm_term=como+hacer+una+hoja+de+vida+profesional+en+word PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fddc31c4db56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404133/normal_604b3e05beae2.pdfIn PDF document text
    • https://pebogifi.weebly.com/uploads/1/3/1/4/131438694/2215575.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/kazef-samakumuz-lorurapuziben-mozajimote.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/676b6.pdfIn PDF document text
    • https://momewevegugeb.weebly.com/uploads/1/3/5/3/135326076/nosawaraxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_60580bb222849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_600f1d0f297bf.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/savukojubusum/3d_images_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/registration_form_template_html_code.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/data_structures_cheat_sheet_for_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/android_api_26_migration.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/report_generation_utility_form_61a.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/what_does_it_mean_if_your_crp_and_sed_rate_is_high.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77dfd1a-bc04-47c4-92cb-4ae057ae6580/56252898644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68838a9-e228-4d34-a710-04af2704d3c9/nunosugiroxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71ca1d5-ca6c-4c69-9aa9-c2e94efc1eb0/kuzomefidufovado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326fc72b-1f2e-4fd1-8757-170c2a7c2a8f/xazupezub.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_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 5528 bytes
SHA-256: f7235c32efe083a468f4f8c2638a6ff059ead821b1d2ebf1feeef63c627ffae8
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 11912 bytes
SHA-256: 19284d288d86de5654d8c3d2e45c641fb3516f16a0464c9468ddc9fb0daffe83

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