Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fb5ca9bb286b36…

MALICIOUS

PDF

76.5 KB Created: 2021-09-22 09:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 626bbd2a0f61d24f7c2348157f39a818 SHA-1: fc46270d47e978ab40510952d1e52691b99a1492 SHA-256: 01fb5ca9bb286b36ae41e9c14739b28ce0d406bd5aa300db143b12d84ac3dae4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, many of which are likely disposable or used for link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=shakti+astitva+ehsaas+ki+online+episode PDF link annotation
    • http://nutronicltd.com/userfiles/file/tiroxobopijomivuguzu.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/67597200697.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/64290801164.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/50478758696.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/84448565225.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/sabelakexemufejadiboke.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/60513295208.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/50449887413.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/41106065112.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/16335845299.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/19596804885.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/jiragadajirijekajuzamod.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/68925100025.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/434044884.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/vogavedezidemaguti.pdfIn PDF document text
    • http://rayer.cn/d/files/rovexukipejefunu.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/womimur.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/81745700929.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac94432a85---kakifuwivibijoz.pdfIn PDF document text
    • https://preciseenergygroup.com/media/19747367670.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/69369845548.pdfIn PDF document text
    • http://harlit.com/upfiles/file/76830117110In 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 16804 bytes
SHA-256: 4b1df9ce36ae44f1601721910046724dc45631fceabaac4852566f5ddd39e9ae
font_02_sfnt_off00010be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 10624 bytes
SHA-256: 165700f33e5221c6016e597b6cb7e36ad364a53c9bd21426f88e80d58e8f336e

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