Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dc538ce64a5d07…

MALICIOUS

PDF

108.5 KB Created: 2021-02-20 07:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6407b8476913c6460bbc202be5cc9502 SHA-1: d8a025271915dc0111b6f431994763b9925d43c4 SHA-256: 83dc538ce64a5d07d37091f63f6d3f76514c17d60c48c886d0524327cbe3fced
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets and Weebly domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://seumenha.ru/wb?keyword=cuantas%20paginas%20tiene%20el%20libro%20del%20principito%20completo PDF link annotation
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/4919591.pdfIn PDF document text
    • https://cdn.sqhk.co/setewefasari/jhja7jj/kujosudaradegotijirabatep.pdfIn PDF document text
    • https://muvitexovab.weebly.com/uploads/1/3/4/6/134639258/dotupefepu_topeguranum_dukugez_dibozajukaveko.pdfIn PDF document text
    • https://zajosozuxisofe.weebly.com/uploads/1/3/1/4/131407459/a05f7e1f7.pdfIn PDF document text
    • https://fuwosijeven.weebly.com/uploads/1/3/0/7/130738701/nedebinonison.pdfIn PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/5569727.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/hhzCP0J/85579569265.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/xuvamuba/zokukuwaguxasefupopawason.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/21549073563.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/199142797.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/xoladur.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/demographic_questionnaire_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/aadukalam_songs_lyrics_free.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_off000167c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C8 5436 bytes
SHA-256: fa20ac617fd95048551340257ac575361d77aeb71c326dff111f92c3f54b71d1
font_01_sfnt_off00017a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A24 12544 bytes
SHA-256: 5453603d7477e77b6070431063961e3879495977543ca7646436b299556bcd2c

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