Malicious PDF — malware analysis report

Static analysis result for SHA-256 273ff94b6c8edb73…

MALICIOUS

PDF

85.4 KB Created: 2021-02-23 23:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85d84f2d85928315fd9a9f346edee892 SHA-1: b4d01b1c9a12a6ceae202a648ac959deb1e4ffb7 SHA-256: 273ff94b6c8edb73c73d5a68fde8e8d684fa14560d3afce8e6687204c85f9d97
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a phishing/malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to job opportunities, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=how+to+get+a+social+work+jobs+in+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475392/normal_60185d6f77302.pdfIn PDF document text
    • http://fupofejoja.22web.org/61967576246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5fefeb3397c51.pdfIn PDF document text
    • http://bemigovoso.iblogger.org/28990898794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420586/normal_5ffcaa4a305f1.pdfIn PDF document text
    • http://nosetibadap.iblogger.org/antietam_battlefield_map.pdfIn PDF document text
    • http://xuforixek.22web.org/totaline_thermostat_p374_removal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418587/normal_5fd0dc76c824b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nutogexutal.rf.gd/sabepeluxevetodujol.pdfIn PDF document text
    • http://matemot.epizy.com/osrs_fletching_1-_99_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/beauty_spa_games_free.pdfIn PDF document text
    • http://pumumiz.epizy.com/93559181889.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/jassar_weather_report.pdfIn PDF document text
    • http://livunox.rf.gd/irregular_plural_forms_worksheet.pdfIn PDF document text
    • http://jefusebu.epizy.com/linijekibadafunir.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_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 5300 bytes
SHA-256: dd38d729ec3741227f1249f43ecd4749d8867513a09d14c2c7557ea460366945
font_01_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 10832 bytes
SHA-256: 9e5a8dbdd51fb5046f8efe5f96dffa694d14e3dd73348cf82ae72c595978b4e7

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