Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa3d12b85f2e6bb…

MALICIOUS

PDF

77.7 KB Created: 2021-04-13 21:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 54592bbb0d4f35d6a4c73d5d4e20860f SHA-1: c25809ef910b76d8d40056c1a98e0041c727139d SHA-256: 4aa3d12b85f2e6bb97341f558c49848f3a1b897bd9f29a2fb87354ba206de311
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect the user to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=2007+ford+mustang+shelby+gt500+specs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411932/normal_600265e404863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487206/normal_600ca67382a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_6045f4a6e6015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_601bcfa64e5a8.pdfIn PDF document text
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/selojebuxo.pdfIn PDF document text
    • https://fasilusizewolas.weebly.com/uploads/1/3/5/3/135313848/zukodomovesawat_tikujebobik_voxefaz.pdfIn PDF document text
    • http://nosetibadap.iblogger.org/14301534148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380887/normal_6005521f6b7e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451754/normal_605129ad45c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_603b62ca0afa0.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/4545000.pdfIn PDF document text
    • http://fipalugoli.22web.org/how_to_empty_black_and_decker_dustbuster_pivot.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/meludav/7644744365.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/hydrology_report_for_rulo_nebraska.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/saxedufup.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/bootstrap_4_template_sample.pdfIn PDF document text
    • http://ruxusanufip.rf.gd/free_cash_flow_example.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/53707871904.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/nios_case_study_format_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/4124702243.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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 6196 bytes
SHA-256: 7b4f6f3670bb5b87cbb9e377ea0be5d84b388d4dad7d1fceb976e0dcc378b2f0
font_01_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 11416 bytes
SHA-256: f42f6bdd72f2bbdadd60209ebd8a35ca58c3c2175e227507fcb0c3cea7efce83

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