Malicious PDF — malware analysis report

Static analysis result for SHA-256 7737be458b0cb9bf…

MALICIOUS

PDF

71.3 KB Created: 2021-02-17 12:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cadf93076694b07770b956e051e6f85f SHA-1: 6dc9f508e2e990887d495a647b21af6f364795a1 SHA-256: 7737be458b0cb9bf11c65ad23a7a68d8ad8cf7077713a699de20c76b2faa7a57
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, forming a link farm, and is detected as malicious by ML classifiers and ClamAV. The embedded content, though obfuscated, suggests a lure to external websites, likely for phishing or malware distribution. The presence of external URIs and a link farm indicates an attempt to direct users to potentially 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://druttle.ru/wb?keyword=neuropsychological%20assessment%20of%20dementia%20in%20adults%20with%20intellectual%20disabilities PDF link annotation
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/fudode.pdfIn PDF document text
    • https://tenemetit.weebly.com/uploads/1/3/2/6/132696414/wuwululoxovure-fovemasor-jivixitavukafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5fd3bb6a39053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5fd3226fb77e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408476/normal_5ff1bfd9c4df3.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/rodog-wukaga.pdfIn PDF document text
    • https://sowefitubi.weebly.com/uploads/1/3/1/4/131406610/c9bea98103517c.pdfIn PDF document text
    • https://lirisuvobuku.weebly.com/uploads/1/3/5/3/135399047/851767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365545/normal_5fe0ebd7680ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461509/normal_600898682d2e9.pdfIn PDF document text
    • http://dubiniba.iblogger.org/lagu_santesh_amalina_versi_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/ridgdih/15731856515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_5fd7ea4e491e5.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/4239042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450884/normal_5ffef8489ebe1.pdfIn PDF document text
    • https://lujotasapamuxa.weebly.com/uploads/1/3/0/9/130969194/8047897.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mebupeb.rf.gd/mezenuwafojos.pdfIn PDF document text
    • http://juxawewoguseku.epizy.com/58395067098.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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 5872 bytes
SHA-256: 4f19130fef86765bfbc2bf0cde8240504c32154b9abc33e06ecdc5f230a7a23b
font_01_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 10488 bytes
SHA-256: 62df00f5ddf0995d74e13337c33f6a5111b55fbc9433bd8d38705761f199fceb

Open this report in the interactive analyzer, or submit your own file for analysis.