Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edd35ae15908c56…

MALICIOUS

PDF

87.3 KB Created: 2021-03-09 07:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ebd928ba94e0f31ff3384122fe2b6ba5 SHA-1: e0f0aff7a599d3a6172e060cc3c285638e718273 SHA-256: 5edd35ae15908c56c468904dd29756e70a191453aaf617f252d13433255ca954
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to generate traffic or distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://dugedepap.ru/strik?utm_term=what+are+5+needs+of+all+living+things PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5fe40da61fcf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489740/normal_5fceb154b2958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_601dcd085f462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_6038e720c1b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_601ddefa9bfc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_603e7fae7c480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_6007ece264375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_60210d84b7344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388416/normal_5ff4d30cdf5dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493579/normal_5fdf47f0185c0.pdfIn PDF document text
    • http://dogusiwimukames.iblogger.org/86572790986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_59ee992192e64854a65f54dfd8d081d9.pdf?index=trueIn PDF document text
    • http://xozutafutigifa.rf.gd/18083746036.pdfIn PDF document text
    • http://napuvonir.epizy.com/6664100971.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_8c003b2187654213ae412b2ba39eb458.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ac085a-dd83-485e-94de-9a28a4d7d95a/ariens_5520_snowblower_for_sale.pdfIn PDF document text
    • http://febarufowit.epizy.com/podofu.pdfIn PDF document text
    • http://fegedenem.rf.gd/57648629164.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_44e94d7f8f75472c8f8f8ca1ee2adb0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7706a7-3c3e-421f-a7ee-28e3e4c5134c/situvunibanux.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_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 5368 bytes
SHA-256: b94a1dde4229ecc4f77f151bf147f1cbc7fbdba2e483dcf474bf5549f865d77d
font_01_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 10832 bytes
SHA-256: 47bab27a2641524e7b9f48ad6646f033e3f409a335ec0be6d68d57da07f3e7e7

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