Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbb368fb3064f1f…

MALICIOUS

PDF

77.0 KB Created: 2021-06-12 09:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 533afe18cd190b6756800b53c7942bd5 SHA-1: 810a5259d2e08146f329842792fad79eb90f878a SHA-256: ecbb368fb3064f1f02e892332cb2c405cedc3391b4511720fc80efd5db583e4c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=tutorial+photoshop+cc+2017 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393911/normal_604a9f1a6b2f2.pdfIn PDF document text
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/rujokokefojamo.pdfIn PDF document text
    • https://batuputuj.weebly.com/uploads/1/3/0/7/130739628/kazoludowomabav.pdfIn PDF document text
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/fumonut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_601b9d777506c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475725/normal_60638c8966b4f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4488330/normal_60b4cda120d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_605b67dc77ee3.pdfIn PDF document text
    • https://dizalojowu.weebly.com/uploads/1/3/4/8/134866254/junikuzisom_silebejuxuwin_lupinurogax.pdfIn PDF document text
    • https://pojigivawoju.weebly.com/uploads/1/3/5/3/135348152/6171310.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/28a5023da3d155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_5fd662a046acf.pdfIn PDF document text
    • https://varudidijosafi.weebly.com/uploads/1/3/5/3/135316544/mikonegutefarilob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_603d2f6e2f924.pdfIn PDF document text
    • https://xudorelaguf.weebly.com/uploads/1/3/0/8/130813521/wajanuwozokedabujafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fc9f4ccb9aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459788/normal_603bcb5656519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_604d201e1a22f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465694/normal_5fe451c94a0da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460045/normal_5ffa30b89d47a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejivab.pbworks.com/f/54159300342.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/145175373/23742655496.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/how_do_i_get_presets_for_free_in_lightroom_mobile.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/67960761851.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_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 5376 bytes
SHA-256: 92988313dd8ac62689a9bc0196df020f5c579535616e073db3276eaa34e1e2e2
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10544 bytes
SHA-256: 96d4b28d327e2de69945e0c6f8d7a87804a381c52e9afad7ab3b02bcc7fdbbc3