Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb7b933af0f691d…

MALICIOUS

PDF

64.1 KB Created: 2021-02-10 16:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6098013628599f784037c981b3b72c39 SHA-1: 237c57b5f18bba9559481faeb4142115d691a722 SHA-256: dcb7b933af0f691d756b94961fbd9f178b9817c9a1546b5629d9f48988844160
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=bowflex+power+pro+xtl+manual PDF link annotation
    • https://suguvojonejufo.weebly.com/uploads/1/3/4/5/134585364/db1be6ce.pdfIn PDF document text
    • https://vofovolovun.weebly.com/uploads/1/3/1/4/131483423/9bbb90.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/jadiwatisegoji.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/xezixe.pdfIn PDF document text
    • https://cdn.sqhk.co/muzubasiwu/Hhiijih/7905659826.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/cc0efaca.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/debep_papijuzivepo_gibanu.pdfIn PDF document text
    • https://cdn.sqhk.co/rolekixawute/ciahhha/14894721706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5ffcb75cb0df4.pdfIn PDF document text
    • https://wemovimezatura.weebly.com/uploads/1/3/4/6/134611727/wufarazufaxed.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/duwuk.pdfIn PDF document text
    • http://vijufik.iblogger.org/wexatagafob.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/12043.pdfIn PDF document text
    • https://cdn.sqhk.co/keragipiki/hlhjhjO/68115030124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494668/normal_60062f239117b.pdfIn PDF document text
    • http://sazaleve.22web.org/62576464537.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zititerawori.epizy.com/alive_video_wallpaper_hd_pro_apk.pdfIn PDF document text
    • http://bodagoge.epizy.com/8273873672.pdfIn PDF document text
    • http://kutoduno.rf.gd/weather_report_hyderabad_this_month.pdfIn PDF document text
    • http://sijedopebe.rf.gd/beauty_and_the_beast_piano_duet.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_off0000c1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C8 5080 bytes
SHA-256: 12adfcc57e5d0432825e50fd0bc48b16e433796b941a18556bca755d48f6d31f
font_01_sfnt_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 9428 bytes
SHA-256: c4a0e0c8a3a474214512d24a98af1d4502880a6aa9fdcdf1ac069ed438ca4f06