Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4965fba53dabf7a…

MALICIOUS

PDF

68.6 KB Created: 2021-02-26 15:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9cd06b53e6044c03cc66e1ec71d07fe7 SHA-1: 9c2c47d8e02ee56d81df3f8dec412419784c2bcc SHA-256: b4965fba53dabf7a7e53daa2b346815d838a9e652659e4d281cebd48f2f1f8bd
252 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to redirector infrastructure and link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirm the file's purpose is to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/wix?keyword=arizona+renaissance+festival+promo+code+2020 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470833/normal_60068da51d24b.pdfIn PDF document text
    • https://tidoxanarapora.weebly.com/uploads/1/3/2/7/132710787/5304176.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/vajutiwavopaxa.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/tifutemenazot.pdfIn PDF document text
    • https://nogulumu.weebly.com/uploads/1/3/4/4/134476008/4e2e935403f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371791/normal_5ff20b5beb83b.pdfIn PDF document text
    • http://kifemefojobamu.22web.org/62883351626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461525/normal_5ff503cccc1f8.pdfIn PDF document text
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/91849.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/2484834.pdfIn PDF document text
    • https://valexipeval.weebly.com/uploads/1/3/0/7/130775413/lewusinejud_befoxinoxifi_xotumat_guberuwakifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lutesugobomo.epizy.com/dadivijupa.pdfIn PDF document text
    • http://tomabev.rf.gd/51215966933.pdfIn PDF document text
    • http://govatojajij.epizy.com/72834573646.pdfIn PDF document text
    • http://kiromimejobodo.epizy.com/english_101_class.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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 5672 bytes
SHA-256: 35e6fb4ef62e75fd709fb5e5284060bbf84783949aafea89319f5563e742a65d
font_01_sfnt_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 10452 bytes
SHA-256: dbca60efc929aa88709cf7f61015d6493627a6df3645e76b115a4df6348bf4f6

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