Malicious PDF — malware analysis report

Static analysis result for SHA-256 9766d5c2ec76ed41…

MALICIOUS

PDF

69.5 KB Created: 2020-12-20 06:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 56060b2a81790f81d65213a853660361 SHA-1: 3fdeb5e9858a149b9930c18b76a9ec45aa55deb2 SHA-256: 9766d5c2ec76ed414e626fed3a298e707f60848cc6c05bcbed65121636cad391
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' containing 28 external links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to direct users 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://traffset.ru/strik?utm_term=fastpitch+softball+pitching+rules PDF link annotation
    • https://bujugumaxu.weebly.com/uploads/1/3/4/0/134096797/bd6ef7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5fc46ac30e246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5f8c1e5145b65.pdfIn PDF document text
    • https://gafukarufigak.weebly.com/uploads/1/3/5/3/135309608/putoriwepuwex-pimarawuvibefev.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/titugome/bug_report_summary_example.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/bullous_pemphigoid_treatment_guidelines.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc066bd9955c744b5390948/t/5fc0ea0e18e72e5fdbf8b6f1/1606478350705/80396783531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3309b668-edd3-4a57-9ae3-76c40ad35e69/ecuaciones_de_la_recta_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/baking_sheet_recipes_vegetarian.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/wozukupowaradako.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/99504890807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d520bf5b-ed17-41c4-a8d2-e6304be140ae/17347803230.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/article_critique_apa_format_title_page.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/96030461040.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 5372 bytes
SHA-256: fbebebb65ce516c57eb483b93ead2f9365d9368ac0b5510106a0eb3b02097eb7
font_01_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 10284 bytes
SHA-256: 93ccb4c679e8d944700a9f92b7a92baf063675513702eae0ae030d0b78233223

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