Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f85b8e411f98f5…

MALICIOUS

PDF

75.9 KB Created: 2021-03-30 13:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326dd2e947441b51adf11deb4e1192cd SHA-1: 5c832261235ae1426cc160e354677c4a896be1e0 SHA-256: 85f85b8e411f98f515d2a1deb4099981db6c209ef52f55495f13ef0c9cf5ca77
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the document's structure and URL distribution point towards a malicious link farm designed to deceive users or manipulate search engine results.

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
  • 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://fokemale.ru/strik?utm_term=best+mechanical+keyboard+under+50
    • http://raisinsapp.club/8852540843oz2qb.pdf
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/5987f991b3f68b.pdf
    • http://siwivelijutore.medianewsonline.com/80774051892.pdf
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/gadapodikodotulis.pdf
    • http://fuwijumazawad.mywebcommunity.org/lazazitukevomitirafe.pdf
    • http://ninomut.sportsontheweb.net/definicion_de_registro_anecdotico.pdf
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/motenapa.pdf
    • http://wolifote.getenjoyment.net/95373738978.pdf
    • http://grantmedica.ru/xetaxozibalubugisodowezux63c2g.pdf
    • https://cdn-cms.f-static.net/uploads/4376105/normal_6010fd7e7b401.pdf
    • http://vibolofisef.mywebcommunity.org/search_engine_optimization_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4403820/normal_601367dcd550f.pdf
    • https://static.s123-cdn-static.com/uploads/4386087/normal_5fecf67598f4b.pdf
    • http://afracheat8.xyz/esquema_de_los_medios_de_comunicacion_masiva_y_sus_caracteristicasqhk8d.pdf
    • http://idealicaufficiale.website/184744815132f18e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bavotuvezomevi.myartsonline.com/72728260594.pdf
    • https://s3.amazonaws.com/dinisemowoge/maplestory_m_apk_latest_version.pdf
    • https://s3.amazonaws.com/vaxebisapesi/56341805426.pdf
    • https://s3.amazonaws.com/marimejerebo/ziwemekefakoxop.pdf
    • https://s3.amazonaws.com/pubopelej/32858568403.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebef.bin
c070cb72d00b79e94f7febe865ce147feca866d570c9d9748b874b431142699c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 5800 bytes
font_01_sfnt_off0000ff8b.bin
d8531bd2c5ff6a33831e78a4b82080889450a1260ff6fc878ec7517211c0332e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 10252 bytes

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