Malicious PDF — malware analysis report

Static analysis result for SHA-256 05de31b025efd76a…

MALICIOUS

PDF

85.2 KB Created: 2021-10-05 00:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2e0507e74465d4b73b47a7fe39b9146 SHA-1: 2cc9470455810f042fc3aabc2adeef5542a1c9ca SHA-256: 05de31b025efd76a7f8408caedc85ea0ae82062374652786c9396d1f9f4224ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rivieresoceanie.com/ckfinder/userfiles/files/bikulevidibovukeb.pdf In PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/83799184214.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/puzebawezudefex.pdfIn PDF document text
    • http://banquat.com/userfiles/files/totafanesilab.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/14177719059.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/281e6cd0279d2c1b1bc533047d520633/satadaladi.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/jiwinopotegedajawi.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/duronigibaruf.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/73932410666.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/37074618193.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/68761776157.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/xamunuzomapide.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/75013659789.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/rigozurebu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/bavowemawudujetijesesi.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/gukiretuzikifewekadoriza.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/39b1d9b614dd481520db53e01efc03de/41904340733.pdfIn PDF document text
    • http://gardatrans.com/content/Files/punilezokususe.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/41970815577.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sujawufefurajufagag.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/95352686240.pdfIn PDF document text
    • http://greenglobepms.com/uploads/ginitijamorawofuzoguxifen.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/fasesevuxuroniroseg.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/27817785672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=class+9+science+chapter+9+mcqsPDF link annotation
    • 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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10864 bytes
SHA-256: 8fbdd770aba071ef9ef81292e09a0e85cbc481094efc4c5a13a8519bea3f768a
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 19904 bytes
SHA-256: fad0361b79bff9801b69a0b4ad3060be252ddf0c3026e97bfcdb525713c3401e
font_02_sfnt_off00012f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1