Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd550805ff3174b…

MALICIOUS

PDF

71.5 KB Created: 2021-02-23 08:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cfff2251467a736b6eb01e9fef7a2395 SHA-1: 22d42dad535fbd05f4d0d117663d6fee96bd5867 SHA-256: 4cd550805ff3174b17139631b749d4a974d1902d1c46052b33fdce4f27f6ece7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text that appears to be a lure, further supporting the phishing/malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=two+raw+materials+needed+for+aerobic+cellular+respiration In PDF document text
    • http://meweremidef.iblogger.org/autogenic_script.pdfIn PDF document text
    • http://klosheff.xyz/bpcl_recruitment_full_formwg7mz.pdfIn PDF document text
    • http://com-connexion.xyz/live_nettv_apk_apphpp59.pdfIn PDF document text
    • http://jelesanu.iblogger.org/vanas.pdfIn PDF document text
    • http://tajafife.iblogger.org/lepememojuvemuso.pdfIn PDF document text
    • http://neojust.ru/rci_2990_manual5sd7n.pdfIn PDF document text
    • http://luzepusi.iblogger.org/86548472773.pdfIn PDF document text
    • http://mebel-albero.ru/56312389761iekh6.pdfIn PDF document text
    • http://vepekideku.iblogger.org/angular_6_formbuilder_default_value.pdfIn PDF document text
    • http://ruzodoveme.iblogger.org/61112642614.pdfIn PDF document text
    • http://vutanari.22web.org/99955673921.pdfIn PDF document text
    • http://xezakekefeba.iblogger.org/answers_traduo_para_o_ingles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sugunava.epizy.com/what_questions_to_ask_recruiter_during_phone_interview.pdfIn PDF document text
    • http://fefomuk.epizy.com/rodisefidixoni.pdfIn PDF document text
    • http://favuzokusom.rf.gd/algorithmic_trading_platforms.pdfIn PDF document text
    • http://gepesosanar.rf.gd/71368323155.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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 5480 bytes
SHA-256: 115844b304aff6238f043a5559eeb26e7f1d395e801d669f81685ee0acbbe5df
font_01_sfnt_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 10544 bytes
SHA-256: 822c5a2d6d677495c066a1a205da230b4df836727f5bc19a77984fb912e1e102

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