Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c78db2910c1415…

MALICIOUS

PDF

77.2 KB Created: 2021-02-23 17:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b00219d74f2f1a1b632adcfc930d3ed5 SHA-1: 4ae56c8f040717b8c08d883531c95c59e54f128d SHA-256: a3c78db2910c1415d145388586ab1fa35e68db7114d9f0de13591baad2004785
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content, possibly for phishing or SEO manipulation.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+to+use+for+android+development In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fcaec90bb404.pdfIn PDF document text
    • https://cdn.sqhk.co/kutisetu/j3CWnjg/37897348823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_601b0641ea3c9.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/ibjahf3/xubufivuleso.pdfIn PDF document text
    • https://kefenatab.weebly.com/uploads/1/3/4/8/134854159/3892227.pdfIn PDF document text
    • https://jatupixi.weebly.com/uploads/1/3/1/3/131398141/6407316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443344/normal_60036f71a6b06.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/8gighZm/carson_wentz_fantasy_espn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_601e20b5801f1.pdfIn PDF document text
    • https://gebulofafilo.weebly.com/uploads/1/3/4/7/134717894/sedosesog.pdfIn PDF document text
    • https://nuzaguwimera.weebly.com/uploads/1/3/4/4/134492670/1809294.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/nigimul/primeiro_de_novembro_feriado.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/clinical_trials_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/grievance_letter_template_free_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/75681075553.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/nirazomaredupopafexipe.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/braun_series_7_shaver_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/the_time_travelers_wife_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/instagram_stories_hd_online.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_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 5356 bytes
SHA-256: 1bbf851c6d9d73fa0c732710380266c8041b27ec1afcf7b5831240ff313ab3ce
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 11872 bytes
SHA-256: 6421b1bf17716fa1dc8f85b46cccc8ce2171d92eca75a697629094c22021626e