Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0266fceadb565ce…

MALICIOUS

PDF

75.8 KB Created: 2021-02-19 01:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: eee7c0d6230eb58a2def1cba7800bf22 SHA-1: 167d0007712695a50f9c8a8b0638a435bb124ace SHA-256: a0266fceadb565ce637edadebeb6d325e2917ae3a69b284b82c68da71860f131
126 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 hosting or redirector services, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to '4 pics 1 word' and 'wkhtmltopdf', suggesting a lure disguised as a game-related resource to trick users into visiting the linked sites.

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
  • 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://jottigo.ru/strik?utm_term=4+pics+1+word+answers+5+letters PDF link annotation
    • https://cdn.sqhk.co/fusajovogi/s3nwaia/wild_west_zone_wars_creative_code.pdfIn PDF document text
    • http://tepepowaz.22web.org/radetotabexu.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/Hhb8mhg/43903386361.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/ugd1tIU/81118589582.pdfIn PDF document text
    • http://jodopafipunew.22web.org/bl2_effervescent_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/jhajjvq/yellow_white_pages_directory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5fe775387eaaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5fc76fed61e61.pdfIn PDF document text
    • http://lajulufubugo.22web.org/baxixexasadejo.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/aeLjigh/winisubamub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixodog.rf.gd/young_thug_power_mp4.pdfIn PDF document text
    • http://pejinubonuxus.epizy.com/mobufexarukazopunamipob.pdfIn PDF document text
    • http://kopinakitiwodad.rf.gd/metomunanemesavanetaj.pdfIn PDF document text
    • http://bezepegu.epizy.com/68555079970.pdfIn PDF document text
    • http://lewemezitena.rf.gd/hemophilia_types.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/85488249968.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_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 5328 bytes
SHA-256: caf5fc33d75d2234a06da5d7a14518167a73b07527e215ec22d605bc1ddd4dd8
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 9968 bytes
SHA-256: b0b17a7ad5bbac1d37e1fdfa4789a2b1d9bad22f8f32a8f0777dd3ecb489ecff

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