Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef451c00179b078…

MALICIOUS

PDF

70.9 KB Created: 2021-01-24 03:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6778d91dac8c20f3aa84cf1aa37ca960 SHA-1: 992e69c4d9be2d19acea7a43535fc85547afbe82 SHA-256: 1ef451c00179b07819d4414667d888a2178767dc8b3549831933d2be5e1cbacf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=does+vanderbilt+superscore+act PDF link annotation
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/lulisawunowi.pdfIn PDF document text
    • https://xefapakofaguwa.weebly.com/uploads/1/3/1/1/131164324/favikaseba.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/dad192f23f.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/lorifawuvawot/how_to_facebook_story_video_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/bixby_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/sukuvomuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/guvivojiwoxin.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/nenalatatitarofupaxebuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/best_travel_guide_books_for_costa_rica.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/1852586636.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/5819364840.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/covalent_bond_practice_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/zolabukesenidejulol.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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 5264 bytes
SHA-256: f6d707ace8d1ffeb7cc44b005d85d3196c4dc29176d4df47fc3e7e9b3ee50364
font_01_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 10532 bytes
SHA-256: 281ca235fb279536ecbc4dfad0fb45bbd88311778c3ea29a46e53c833052f9c6

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