Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3c1fb61fd831cf…

MALICIOUS

PDF

76.3 KB Created: 2021-02-23 06:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ff60b16720d4c100e38d8a5c05c6f863 SHA-1: d9683995f3f87432eeac12abd4656e12c6387b4e SHA-256: af3c1fb61fd831cf15b861479876509e4d6716ccee315bc70cc257df1dcd409e
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://druttle.ru/strik?utm_term=dotnet+basic+interview+questions+and+answers+for+freshers', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'dotnet basic interview questions'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=dotnet+basic+interview+questions+and+answers+for+freshers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420752/normal_60184b8092937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_6017ce5bd2695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_5fdaf08ebfa6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5fdc1a259645a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486368/normal_5fd775fc739aa.pdfIn PDF document text
    • http://reactivaperu-2020.com/zitebir3gjl3.pdfIn PDF document text
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/bifatutekiwef_vuvusudeto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fde732a1be58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_6022745d9269e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453902/normal_5fe54498c51ae.pdfIn PDF document text
    • http://islta.fun/644611885613irbl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451757/normal_5ffaa990c5349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484107/normal_602908e9d88f2.pdfIn PDF document text
    • http://afracheat9.xyz/kenmore_elite_he3_washer_troubleshootingbzpv9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496580/normal_6001e47d4227b.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/kavifunaruvi/89290293106.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/amnesty_scheme_2019.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_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 5492 bytes
SHA-256: ffb6ac0d60d1329b6322985e706c427399eeda15dbb5fc84b257b411d554173b
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 10440 bytes
SHA-256: 6d3cc8e363e21ee2f11b874f0cd43e745382fd9099fd9bf829225f0fa548fe52

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