Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f199e0f4545c809…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 10:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: db83983cedd43f7238f38f328a2c1252 SHA-1: df490e99c1b9ec8eebfd5103dc8330f8d60846f2 SHA-256: 8f199e0f4545c8095a751c8318655ad1c7364a742b1bab949901124add6b791c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, aiming to trick users into interacting with malicious links or potentially calling fraudulent numbers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=what+is+class+2+battery+charger PDF link annotation
    • https://tufafoselebore.weebly.com/uploads/1/3/5/3/135389740/044739f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_6020b3a3084c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fe4699f2ac5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393486/normal_5fd99e9674211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_60072c8e994fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367289/normal_5fe14319ae616.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/5422199.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/mefuzopugema.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5fcbf01dd07ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_5ff77602588b9.pdfIn PDF document text
    • https://kuxadolawemigos.weebly.com/uploads/1/3/4/7/134712866/4072e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_60095b867f1f6.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/bunosopozovasufogu.pdfIn PDF document text
    • https://visigeporoxibus.weebly.com/uploads/1/3/4/1/134131572/kefetesiravo-rofelufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savefativiluz.epizy.com/balancing_equations_practice_worksheet_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/actos_de_habla_searle.pdfIn PDF document text
    • http://xerobesufeworep.rf.gd/35913428112.pdfIn PDF document text
    • http://zigufaza.epizy.com/aprendizaje_basada_en_proyectos.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/zixutubopewigibedit.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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 5448 bytes
SHA-256: 1b4882ccecf09d2bc9d65bf6d95771ed9b14bee7311374d6c6b5606867e99651
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 10400 bytes
SHA-256: db1990e7ee64611373eada00cdf72e4b0cf9e41925c285da8ee5be91e6eece5f

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