Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2229321fb14be8…

MALICIOUS

PDF

68.3 KB Created: 2020-11-10 21:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ee24f995972cb7074a290ca561f9f50d SHA-1: ebd53d75d9dd04e3c1bcfbc88412aaaa5f02da1c SHA-256: 2b2229321fb14be8826734f1aa081bf55b70cf5e56d003294d93f2888fc259a5
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous embedded URLs pointing to various domains, including disposable hosting services. The heuristic 'PDF_REPEATED_PAYLOAD_LINK_LURE' specifically highlights a URL intended to deliver a payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure suggests the PDF is designed to redirect users to potentially harmful content.

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
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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://traffking.ru/strik?keyword=clicker+heroes+save+game+editor+itshax.com In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f8d5c438f488.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/5804911.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/luximinidivir-bavuzeji-bibasi-gixejononomi.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/gamejuwu-zajonadupujowiv-jexegewetixinib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f89f702d5766.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/besuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f8e201658394.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/6981840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_5faa2b8013e05.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/2f39f47a-3b76-4cbf-881b-2414aef9d892/medifast_program_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/human_physiology_book_by_sembulingam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516aebc1-2892-4ef4-a524-4763cd77d6ff/44554148037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924506f1-489e-458d-8cf6-35b69478f3ec/vipusorezefutarutenifarab.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_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 5484 bytes
SHA-256: 2ffcd2553f2fb82f23e022cc7086287e3eae6f5afc58c71e0efad38fd87cc428
font_01_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 10936 bytes
SHA-256: 859ebe460014b5a32e9f1e3f4c711667bfcb1f463692051d5ba48053154fcec6

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