Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a31e9760edc7cda…

MALICIOUS

PDF

74.1 KB Created: 2021-05-21 05:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0c6f283368e1e100f8d1a203b276ad1c SHA-1: 03d300dff1b4db5d5c92553f11d6dd5d05b49b4a SHA-256: 3a31e9760edc7cda6122e0dbe842c227caf18557a58b20f891093b1b1d227d87
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on disposable domains, designed to mimic search results for a game hack. The primary URL, https://botokaw.ru/strik?utm_term=walking+dead+no+man%2527s+land+hack+apk, suggests a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=walking+dead+no+man%2527s+land+hack+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458827/normal_600c831be2d72.pdfIn PDF document text
    • https://duxezixupedad.weebly.com/uploads/1/3/4/0/134095883/nakevafonavep-vusil-luniner.pdfIn PDF document text
    • https://vipamabukaxeban.weebly.com/uploads/1/3/0/8/130874648/969936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_60015ead8c8a8.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/tikebilexowami.pdfIn PDF document text
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/3833796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_602c1145e69f9.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/rofugixerinidamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_6031b5639e988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fe563debb9dd.pdfIn PDF document text
    • https://pepevifive.weebly.com/uploads/1/3/4/4/134480859/gokura_lozufotun_fomebuzosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_5fd651dd171eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_60305cb6433fe.pdfIn PDF document text
    • https://zanefasijim.weebly.com/uploads/1/3/5/9/135965469/nesubew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_60384c848da21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fecb28b1c0e4.pdfIn PDF document text
    • https://konupalak.weebly.com/uploads/1/3/5/3/135315701/wobeve.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/wibedubosateg/61264261561.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/acurite_rain_gauge_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/60040366739.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/53007586758.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_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 5500 bytes
SHA-256: 043a7f6a8ccfcf6729a187a163e8b79002f565823b66de469f0d1d07bef1040d
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 11072 bytes
SHA-256: de8678e4b21ed7db71ea73e32cdca36bcb4943ad833eb27f197ea7d138527688

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