Malicious PDF — malware analysis report

Static analysis result for SHA-256 b521f5cb879cd570…

MALICIOUS

PDF

73.6 KB Created: 2021-02-18 22:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2c88a26fa00fd6b26fee2fda55e637a9 SHA-1: b5808d37d95dd5d8d226402e876bd0fd83394eea SHA-256: b521f5cb879cd570bf289b407f573ae2ca1311b019613529b88ab9ca5a0f8bbf
154 Risk Score

Malware Insights

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

The file is a PDF that contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=ti-89+titanium+probability+and+statistics'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain metadata related to a calculator and PDF creation tool, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=ti-89+titanium+probability+and+statistics In PDF document text
    • https://nefixesuxu.weebly.com/uploads/1/3/0/9/130969456/gezagodebabavisami.pdfIn PDF document text
    • http://tk-time.site/vebufifuluxapitatadet6upl1.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/gihYFpX/bass_pro_shop_rancho_cucamonga_shooting_range.pdfIn PDF document text
    • https://damanula.weebly.com/uploads/1/3/1/8/131856109/tilubenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fde11de4a5ca.pdfIn PDF document text
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/028c1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fd60b9c914da.pdfIn PDF document text
    • http://pumutug.iblogger.org/17262974159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495686/normal_5fe66b0c2d19f.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/j1U9tlx/73429004608.pdfIn PDF document text
    • http://wonnaturila.space/lelavegizamotajatijepadia8r0c.pdfIn PDF document text
    • http://fruitslope.online/cylinder_head_porting_guidextxgj.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/zagapaxa/sumerian_cuneiform_symbols_and_meanings.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/84134287238.pdfIn PDF document text
    • http://tutivute.epizy.com/vmware_workstation_15._0._1.pdfIn PDF document text
    • http://rejeremonuwiz.rf.gd/sivojo.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/21005155216.pdfIn PDF document text
    • http://tadigolunus.rf.gd/tanadaxufevarumemux.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/koziluwowolilowesoboxo.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/purchase_agreement_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/54271194486.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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 5792 bytes
SHA-256: c594ba48be8895e4541c7de79c35e82a666b426d5fea63efed76c80fce9eefb9
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 12100 bytes
SHA-256: 882a67787b27200e9a029bc45abef77c5489b6b9167866624a39fbc1ad64212e

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