Malicious PDF — malware analysis report

Static analysis result for SHA-256 232c6f7e586247d8…

MALICIOUS

PDF

105.7 KB Created: 2021-03-16 11:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6a0915fb3ee03be005d9aebeedcb1c1b SHA-1: 60c5cbf4e67068f6dac6518598355396acf3bae0 SHA-256: 232c6f7e586247d8b4c523e3b096684759c272c1679eca61dbd669fdf5101360
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of many external links on disposable hosting suggests a campaign to artificially inflate search engine rankings or to serve as a distribution point for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/award?keyword=obesidad+y+riesgo+cardiovascular+pdf PDF link annotation
    • https://dosoxikovere.weebly.com/uploads/1/3/0/9/130969917/bc46998dce.pdfIn PDF document text
    • https://gezedasi.weebly.com/uploads/1/3/1/3/131378850/pijukumazesim-jitirezuxisasow.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/lulevabo-gagaseba-farubalafu-soved.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/6588110.pdfIn PDF document text
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/3cd5aa2.pdfIn PDF document text
    • https://cdn.sqhk.co/rirexiwudag/gdFhfyb/2352247436.pdfIn PDF document text
    • https://cdn.sqhk.co/jujifefa/Uifjfif/sabebizisesaxus.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/Nge5Jnf/air_traffic_control_system_failure.pdfIn PDF document text
    • https://xarugowa.weebly.com/uploads/1/3/4/7/134733051/7001409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5fde3d36af183.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/jieifia/pemixebojixe.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/laxewevixeb.pdfIn PDF document text
    • https://pesenulowujef.weebly.com/uploads/1/3/5/3/135325158/pafexefupumiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5fee672375e49.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/xjjJkQ0/suwodowoden.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/1822552.pdfIn PDF document text
    • https://foxenezave.weebly.com/uploads/1/3/5/3/135316699/wanuwaxenesiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_71934a3bd48d4a0d922150cbacdd555d.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_144e9d7cc4c14d56af6f1f0b86b66f0f.pdf?index=trueIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_647ffea22da049818e1eab0a3b85b5f6.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_97139524f6f74c458eb535c7a66624d9.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_2875dbb8412c4399bbd2007a9628ea7d.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_5e5378d74d85489f9690ad82e488d158.pdf?index=trueIn 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_off00015c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7A 5652 bytes
SHA-256: 0c65da479e988f5c8e6c1ee9a77d78482107b0d0dcd53c612a8c413c072d5a23
font_01_sfnt_off00016fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC7 12348 bytes
SHA-256: 614eb255fd198b3057f0c7f56ef5af4d9d065bdbdef6c2acd0ce4061c41e30f1