Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a8991a03861172…

MALICIOUS

PDF

75.7 KB Created: 2021-04-16 00:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b61305d108dae63cefcdd41014b17662 SHA-1: 28dbee38f1a060d90b8697b40f0fa158fd5460e1 SHA-256: 70a8991a03861172600fa165468fb3c06f9b2de62e63e8b6d29caa53bc7a6c87
184 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 numerous embedded links, with at least one pointing to known malicious redirector infrastructure (https://yafferge.ru/strik). The document's structure suggests it functions as a link farm designed to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=fieldpiece+sman360+problems In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_60233216e8418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_600395a63a799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_60357ae4ecad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_5fd8a22e16e34.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/90029862975.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_5febf8d0a592b.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/gadudivulazabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454984/normal_5fe52c5ebc5da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_6027c2e033c6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5fe2f63b094f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_606ddc4b01be9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5ff4362b04807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_606d148665456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fe29423bad82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fe709d0a806d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/purple_cow_ice_cream_recipe.pdfIn PDF document text
    • http://majuzudotalu.epizy.com/enlaces_covalentes_del_agua.pdfIn PDF document text
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_fb8d5ca5617f4bbc9491430fd103ec05.pdf?index=trueIn PDF document text
    • http://sepazebop.rf.gd/beats_audio_exe.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_c8c17a6d7c484e3e906ca53706328168.pdf?index=trueIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_a48e3f0a211f4641b7df30a87744ff72.pdf?index=trueIn 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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 5776 bytes
SHA-256: 17a289c6484da3185b5823b2737c7a0ee6107651108b9f5773bee375dde7351d
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 10532 bytes
SHA-256: 5d6940a16c161c03fd7a0a158b43e4eba6cbf8f67d1f0266883c1ee833f6935f

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