Malicious PDF — malware analysis report

Static analysis result for SHA-256 649fb1912e6d2c54…

MALICIOUS

PDF

81.0 KB Created: 2021-02-16 07:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e8e03f50d89e37104dad808792bfa4e3 SHA-1: 2091a1aa0e8b4459bd6faa76c2730ab01e7f303b SHA-256: 649fb1912e6d2c541d47ecb3c3776067d7db01608a6923573e3b14f79535b7ae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL points to 'jacksth.ru', and another linked PDF is hosted on 'weebly.com'. While no scripts were explicitly extracted, the presence of embedded PDF objects and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/123?utm_term=what+careers+are+available+with+a+communications+degree PDF link annotation
    • https://jofanota.weebly.com/uploads/1/3/2/3/132302765/metawonoru-dulefedeg.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/wujixus/59097992679.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/askep_patent_ductus_arteriosus_pada_anak.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/25052274870.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/invitation_letter_template_for_japan_visa.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/baseball_star_mod_apk_1._6._7.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/27984544832.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/chris_brown_ft_gunna_heat_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/menerozevujufad.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/42855083312.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/73718167190.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/football_crest_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/belowawivap.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/38625492358.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_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 5660 bytes
SHA-256: 82401ec29064d7aa40b8ac791f2b66e5a1aadace99931f4a881e23783cd4cfd4
font_01_sfnt_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 11096 bytes
SHA-256: 22b80922a9d5d6c214473595a46ddc7a20294124a1003743ac5a2f3a10a1be61

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