Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d666c89153219b…

MALICIOUS

PDF

72.5 KB Created: 2021-02-23 04:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 51c035752f3a0165c5310c411789dc07 SHA-1: e4c38510b9f60719bf38f8097df56127efb91e63 SHA-256: 37d666c89153219ba993be02290f5f2f81e99a083043bb543fbbf8f006fbf022
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is likely a phishing or SEO spam document. The document contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest malicious intent, potentially involving the exploitation of PDF vulnerabilities or the delivery of further malicious content.

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://leonvi.ru/strik?utm_term=5e+druid+spell+list PDF link annotation
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/lufukanizijud_volukaru_pobejuge.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/ZghXhgA/xomufopepijorage.pdfIn PDF document text
    • https://kimodoximotoden.weebly.com/uploads/1/3/1/8/131856266/636d453.pdfIn PDF document text
    • https://cdn.sqhk.co/nugilatunu/8ifgcLH/jufetud.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/bf85c712ca83a4.pdfIn PDF document text
    • https://bufogepuvuzi.weebly.com/uploads/1/3/1/3/131381066/gesokibotitibaz.pdfIn PDF document text
    • https://kadeniki.weebly.com/uploads/1/3/4/0/134097858/pafujinat.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/2c4e89e0d0272a.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/9397187.pdfIn PDF document text
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/3061498.pdfIn PDF document text
    • https://buzelobuledu.weebly.com/uploads/1/3/1/3/131397981/vulasetekebilodoma.pdfIn PDF document text
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/a08d2b2d318.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/9324693.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/fegiguruwafuwaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokezaja.epizy.com/tobalofetexurexuratotu.pdfIn PDF document text
    • http://megutid.epizy.com/73313814733.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/nejatewipovoxetepukiva.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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 4772 bytes
SHA-256: de6a170433a667405139aa4c1f793a1484033f3155af9086c6256847e0c36ec6
font_01_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 10152 bytes
SHA-256: 4d91aeef40c6ddc6b289c86259666412a07a6a17b44d21944617cbf1e773d429

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