Malicious PDF — malware analysis report

Static analysis result for SHA-256 a952bb2ed645e1b4…

MALICIOUS

PDF

77.7 KB Created: 2021-02-15 01:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 07ce1e58cacd057c31f1b48dba1efbe0 SHA-1: c5fd9c989b22bede69e972fa75dbb809407f1752 SHA-256: a952bb2ed645e1b49a2fb0ac3f65ed44806aa0c1f987732499a8ec7be87ce4a4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=age+of+exploration+worksheet+pdf PDF link annotation
    • https://rejejowurodesom.weebly.com/uploads/1/3/1/3/131398559/89aa998083b6e.pdfIn PDF document text
    • http://smirno.life/5120864191m0lmo.pdfIn PDF document text
    • http://sodaapp.pro/child_couple_dance_videoachjv.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/34ffb96c27db75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fe4aff4dbe79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_600c06a94a06f.pdfIn PDF document text
    • https://cdn.sqhk.co/feneradebeza/1L8ljeY/skin_girl_roblox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_601d901d7bd11.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/rjgI0KU/56084200175.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/gihchcg/6165652139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd2d8329e28e.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/cmjaUgj/57348542854.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/hdmmyFS/88155861540.pdfIn PDF document text
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/ludejubebulol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_5fe882d9db46d.pdfIn PDF document text
    • https://kafaxidaduxeb.weebly.com/uploads/1/3/1/4/131438036/8925889.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/widuxade/consulta_del_nuevo_formato_de_curp.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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 5516 bytes
SHA-256: 421ce3826efad72a01426019f36b386b730f3069066cdc1f9a6e6496adfb2dd4
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 11836 bytes
SHA-256: 243627730d3adc9503bd76f7b97ff47d4826665e4b561a78f911898864d0c60f

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