Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a186257f35ff36…

MALICIOUS

PDF

72.4 KB Created: 2021-02-27 07:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5935fdef8763b749061b947400c6a983 SHA-1: ca29dec659ccdcee02cbe63b0651013571c58a08 SHA-256: 99a186257f35ff36cd6522560216040b9c9b01645b7e7fa71f3934d3f1c319ef
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, with one prominent URL leading to a phishing lure disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

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://midufefew.ru/strik?utm_term=how+to+reset+kitchenaid+freezer PDF link annotation
    • http://probmake12.xyz/ramakugupajt7q4.pdfIn PDF document text
    • https://vepifedufonun.weebly.com/uploads/1/3/1/4/131454255/9691360.pdfIn PDF document text
    • http://mscgis.net/song_chineke_ka_by_salvation_ministryyesj4.pdfIn PDF document text
    • http://skywonder.space/3687871660tmnsz.pdfIn PDF document text
    • http://afracheat2.xyz/bookkeeping_checklistcylnx.pdfIn PDF document text
    • http://byseles.xyz/87779681713ennia.pdfIn PDF document text
    • http://natasisenexu.22web.org/guidelines_aspen_2016_traduzido.pdfIn PDF document text
    • https://kaxitojuwomig.weebly.com/uploads/1/3/5/3/135302818/zaribure.pdfIn PDF document text
    • https://dumugeve.weebly.com/uploads/1/3/5/3/135318044/052eb74f35ebef2.pdfIn PDF document text
    • http://kewegagibemidaj.22web.org/vetitenidokabolix.pdfIn PDF document text
    • http://aycotoro0.xyz/abdomen_agudo_no_quirurgico_2018wr67e.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/jojanejo.pdfIn PDF document text
    • http://pojekofa.iblogger.org/zepijidekexulezelovutud.pdfIn PDF document text
    • http://coolmag.biz/marketplace_app_not_downloadingpqltu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bimolonimu.epizy.com/ridgid_shop_vac_repair.pdfIn PDF document text
    • http://watekiz.rf.gd/how_do_i_edit_text_in_paint_3d.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_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 5244 bytes
SHA-256: 85dfbe39002bfc132654368d5d9c009d59ca904a1484ace7929f8d3dba1cc0f9
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 10104 bytes
SHA-256: 06fbe09962516b2a2e57e8fbdd86c0cace0b6dea7edaeb207efd403a792613c9

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