Malicious PDF — malware analysis report

Static analysis result for SHA-256 cece5f1adf38e554…

MALICIOUS

PDF

76.9 KB Created: 2021-02-11 18:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d0c1a3beae48ab003269b7b125b3c1c2 SHA-1: d631ec194b98ee8e042795400864c86176a8d01e SHA-256: cece5f1adf38e554ccade23e821471689b9c50861bb9ffb737b69755ea6f656d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with a notable one being `https://jottigo.ru/123?utm_term=geertz+thick+description+summary`. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware delivery attempt.

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/123?utm_term=geertz+thick+description+summary PDF link annotation
    • http://vwwv-avito.online/ritibeveripebugda6g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5ffa4ce7e8037.pdfIn PDF document text
    • http://idclick.cash/mariadb_mysql_manualw5wf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_600c25577700e.pdfIn PDF document text
    • https://vitekasawo.weebly.com/uploads/1/3/4/4/134456264/973bf1909.pdfIn PDF document text
    • http://ledimpress.biz/loopnet_nj_for_sale966uh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_5fd9ad3a2d6f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463533/normal_5ff233deec95e.pdfIn PDF document text
    • http://kayikciakademi.com/20926325114eg431.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/iU9higZ/pedidiboxizami.pdfIn PDF document text
    • http://yoptan.space/bekuwivirazigivolijejibvcaem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5ff09a84801d0.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/mozirolinitaje/tuvijejonelowiwulud.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/43035376684.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_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 5528 bytes
SHA-256: 5444d886e979beca4e326324869c2f31aa0c6d86b5dee363940425b1864866bb
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10304 bytes
SHA-256: 3d45906df63524d3034d1d09f36f4f3fa0463426737982ea633c15a9cc4f6eb7

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