Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eca861a9ec0ec36…

MALICIOUS

PDF

72.2 KB Created: 2021-02-18 14:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d567368c4708eb14e9b5665e32ed958d SHA-1: e796a613d2e9b8f12bb3eb365cb11ecf58a35f61 SHA-256: 0eca861a9ec0ec367254caad0a11305c26979425a2a8187a69f07034891a27f1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=friday+night+atlanta+lounges In PDF document text
    • http://regikenapedezij.22web.org/kojixoruwotuxiwoduximinu.pdfIn PDF document text
    • https://pozopili.weebly.com/uploads/1/3/4/3/134310053/jejimijuzekot_rerunekefokok_lomudebuwej.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/imgilFM/molepovosuzaxupiwep.pdfIn PDF document text
    • http://kozaredibedemok.iblogger.org/82225968520.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/804bf.pdfIn PDF document text
    • http://pimuxiv.22web.org/brush_script_std_free_font.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/pujirageg/aune_t1se_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/stuart_hall_cultural_representation.pdfIn PDF document text
    • http://mufifofoge.epizy.com/catia_v6_student_version.pdfIn PDF document text
    • http://gabepan.epizy.com/migebikuxepidizofavum.pdfIn PDF document text
    • http://tisuvelepep.rf.gd/digakotuk.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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 5144 bytes
SHA-256: 9c91057336d5a0e47bb0ed3fcef4bf49f1428dc6299f020b27b775539128ebf2
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10892 bytes
SHA-256: aa40c49615cef4d7c95c8eb602f7461ee999d7eec7cdb50af3228fcae12cc778

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