Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3ef63c62822879…

MALICIOUS

PDF

73.8 KB Created: 2021-01-15 05:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e484eb8bbb9a46129ba4b5ba2cb62f7b SHA-1: 0ce5b2b79090d33eeb138af74590057ab419372a SHA-256: 6d3ef63c6282287916fc6eae67cb56c8afb6dda4a7d19baf6cfe7a2efd0ece49
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful content.

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://trafffe.ru/aws?utm_term=full+hd+wallpaper+for+android+phone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481985/normal_5ff62eb122bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5fa523977b2f2.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/nusovixowanojapov.pdfIn PDF document text
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/faxipumegogedekexuka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463560/normal_5fc8100446750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_5fbd5bc1080be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fdbe23c9d77c.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/sifawekujiki/broadway_word_font.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/attitude_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/xuxetoboravuzivobun.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/the_originals_screencaps.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/47250383393.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/aql_sampling_plan_table.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/ultrasound_anatomy_of_lower_limb_muscles.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/monthly_calendar_template_2019_september.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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 5000 bytes
SHA-256: a571f5554c687b6fafd4d1bb6b76a3baeda8f2b2fdfed7f9be88c8a478a328a1
font_01_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 11336 bytes
SHA-256: 9c5ba5d8031e991ce07c96a1197e1811f0a64dea008a9a02809328475defa087

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