Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8853e6b51bf616…

MALICIOUS

PDF

81.3 KB Created: 2021-05-31 11:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 346a93ec15192083600396456f1fa115 SHA-1: fc950c184f1ccbfd7985a838c79fdda53f521af9 SHA-256: 1c8853e6b51bf6164df7d8a80ebba2e360b2fbeabfa5db48b63ffa8f7741ec97
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicative of a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or scamming purposes. While no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+to+set+up+accutime+watch+corp PDF link annotation
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/wugakipageb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_600f1fb06e1a2.pdfIn PDF document text
    • https://xelefivaj.weebly.com/uploads/1/3/4/2/134234850/2027331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_602ba5aaf182d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_604192a819ecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5fe694da6671d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_6023e16727115.pdfIn PDF document text
    • https://sekamaxe.weebly.com/uploads/1/3/4/5/134590712/5705934.pdfIn PDF document text
    • https://wavinibavuma.weebly.com/uploads/1/3/1/3/131398010/1633597.pdfIn PDF document text
    • https://tikigafose.weebly.com/uploads/1/3/0/8/130874564/wuxotoxefi-doxuzoredi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fceba6702c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374380/normal_6002bbab00254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_5fe7bd69b243d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fcb9e1f8255a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_605a55200f9ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_604cc3603d154.pdfIn PDF document text
    • https://juloxiwam.weebly.com/uploads/1/3/5/9/135967800/b10b3cfe.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/102b32cc-173f-4f73-9aaa-8810336e65e9/city_mini_gt2_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1635b37b-3ebf-4f82-9ac6-5a7938c483ec/16795698904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d27035-cf7f-436f-af43-587fc6bcb63e/41707430288.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_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 5196 bytes
SHA-256: b63b69163a5b3ef7bb27a3d5fa60ae54ac615fd7a8c0f1cbdfb693849e144ac3
font_01_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 10916 bytes
SHA-256: b7a3d37739b03b706d2092208cc215fe65de9a6207a607ed39f0fbde77cf1fb9

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