Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de13f2d1dc08997…

MALICIOUS

PDF

73.6 KB Created: 2021-05-11 09:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 94608fb746c396d4256fa1b63c73e76e SHA-1: 72649849388c6fff359ac6a579285ccd107ceb32 SHA-256: 3de13f2d1dc089978bcdbfcfab2de449d079e1a257b24f2a2bfa56212c1f1a7d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one, https://ponafet.ru/strik?utm_term=social+media+marketing+for+dummies+2018+pdf, appearing to be a redirector for a phishing or malware distribution campaign. The PDF structure and embedded links suggest it is designed to trick users into visiting potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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=social+media+marketing+for+dummies+2018+pdf PDF link annotation
    • https://cdn.sqhk.co/rorifugera/uDggieD/xukerobosufujilif.pdfIn PDF document text
    • http://kelularuj.22web.org/ueb_braille_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601f400621f88.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/tchibo_cafissimo_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5ffdaffad875d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376404/normal_5fee3e7764a9f.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/Vfjoihz/28549551421.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gawusozuf.epizy.com/puzuwol.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/can_you_plead_nolo_on_a_super_speeder_ticket.pdfIn PDF document text
    • http://xifogufog.epizy.com/the_andromeda_strain_2018_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/49029966488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c06046-cd97-465f-84fd-e977855540de/how_can_trees_help_climate_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb151118-a4f3-40ad-afcf-1361157f4907/91219736374.pdfIn PDF document text
    • http://jugebifa.epizy.com/dwarfisme_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8df2bb-438f-4230-95c1-07cc24a68f76/mafido.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/movigaworowujunemevapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be713381-9aa6-4b43-9cbe-9513b7c873e9/65572775808.pdfIn PDF document text
    • http://nokolul.epizy.com/dewatipalo.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_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 6160 bytes
SHA-256: b614da38018fa13cd5d56d5f594334d08a7b433882d998200dd446301d9dc6bb
font_01_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 10180 bytes
SHA-256: 5cf0c3b7df970f936be1fc0b7e611d832ca728271396204f637e01704646e4a8

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