Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b975462ef69aaba…

MALICIOUS

PDF

77.0 KB Created: 2021-04-16 18:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 208a274437589b71e0e354b182cfd69f SHA-1: 694bf3819482ce05611407e91c4d9455b9448377 SHA-256: 2b975462ef69aabaf14792a8446959052dc25bbb93049bdc59f018cc3cd8ef18
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a link farm, with several pointing to disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://zajinet.ru/strik?utm_term=walmart+black+friday+2020+nov+11 PDF link annotation
    • http://electorat.org/adenoiditis_aguda_y_cronicaq117l.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/5588984.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/desde_el_jardin_warnken_2020db7jq.pdfIn PDF document text
    • http://boost-store.net/aws_redshift_documentationhrtg0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426687/normal_5fefa34536946.pdfIn PDF document text
    • http://samettemiz.xyz/how_to_operate_smart_bracelet_m4wrq39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_603a25861992a.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/51842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_6064fd57c42f8.pdfIn PDF document text
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/be90cc14e4c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_604ce3338f199.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/kigulaxigiror.pdfIn PDF document text
    • https://pavufunipuz.weebly.com/uploads/1/3/4/2/134265556/sabivoxosezil-muxisaxukolos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_605bad80776df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_604db3e56fafb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xomudufe/95667450082.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/medicare_shopping_guide.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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 5696 bytes
SHA-256: 3074ef9989a1e44baea84fae57cb95092fdab9081fc70dd6e535723c418b6fe7
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 11128 bytes
SHA-256: b0a1f301200d7bdcd8f0a86939f120e854167cde9426482ea03046333113815c

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