Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb41dbeaaff8803…

MALICIOUS

PDF

76.0 KB Created: 2021-03-30 23:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 04200b9e3325504b38e15d202a6e21d8 SHA-1: dae7945a3c8654f11c03318abf3ace273cde5d0a SHA-256: cdb41dbeaaff8803ca0fcdaba84f9763c460836931048311c6e7b2f15222151a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary malicious URL identified is https://seumenha.ru/wix?keyword=sola+virtus+invicta.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=sola+virtus+invicta PDF link annotation
    • https://cdn.sqhk.co/wetabupi/gnhf3b0/eldar_mamedov_kaz_minerals.pdfIn PDF document text
    • https://nanopimage.weebly.com/uploads/1/3/1/3/131398258/tonilexedobaren-doxixubuxega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_6057032b8a866.pdfIn PDF document text
    • https://xotubowewetiner.weebly.com/uploads/1/3/2/6/132696149/b49d5.pdfIn PDF document text
    • https://terimigekebala.weebly.com/uploads/1/3/0/7/130738799/daeaf3d3b20470.pdfIn PDF document text
    • https://fadagesaxe.weebly.com/uploads/1/3/4/5/134587500/1371557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fccb0d771daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_605468b44b0bd.pdfIn PDF document text
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/gedejenusamu.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/hg2xMgd/pivamelasowetozubif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490123/normal_5fcd7f7c4a108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fe6f353d54f6.pdfIn PDF document text
    • https://saniruguroxi.weebly.com/uploads/1/3/4/5/134585545/nidomusurav-jitexigediromul-gewasikubirumef-rugod.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/1290464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417408/normal_5ff0610f49015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_6045d5882519a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e41518-42cd-42ff-94fb-4e07c6d87f83/melokifiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa7c44d-b1f5-402f-98b7-9a35c760a477/hurt_feelings_report_army.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d26c64a-3a99-4ef7-8a08-8530f26b2169/bojutexafexojopobozekig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5774233d-e45b-402c-b956-e0b902e8f2c8/bissell_little_green_pro.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_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 4956 bytes
SHA-256: 1187c9b35211b3e2b9e1b94a533bd9cdc028c7ba2cdc2d79d184dc0865063d51
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 11960 bytes
SHA-256: 3c80a5cf5a9f0ee49dc4427a3954e4ea73d433f77fe4fe814a031412421da489