Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ceec5d540b326eb…

MALICIOUS

PDF

77.3 KB Created: 2021-03-21 02:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2b4f509ffd7da8962830c513940d2a80 SHA-1: fb03fa78cb9040bc1ae56e42b5f02346edbd3feb SHA-256: 3ceec5d540b326eb314806a666848d08afc3448802420a590f86205cd44c82ac
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=brother+mfc-j825dw+troubleshooting PDF link annotation
    • http://dojemop.mywebcommunity.org/what_charger_does_ipod_nano_use.pdfIn PDF document text
    • https://wajirabipuxu.weebly.com/uploads/1/3/0/8/130874591/mokewabiwomatak-roberoxugavizi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fc7c391e7af8.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/pafata-tiferoxajakatat-sagexafiden-lumigavupev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5feea29593f0e.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/top_startups_2020_london.pdfIn PDF document text
    • http://usechambre.xyz/380183498640e5xl.pdfIn PDF document text
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/dd61c9d3365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5fd6b064eac99.pdfIn PDF document text
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/2998214.pdfIn PDF document text
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/musuxelawapiwipeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_60445d0cbc7ea.pdfIn PDF document text
    • http://carinsusa.info/jack_and_beanstalk_story_overview4mfxx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90f93d9-96df-44ac-96a0-1db2c64f017f/82632364312.pdfIn PDF document text
    • http://fezovinu.epizy.com/ambir_ps667_calibration_sheet.pdfIn PDF document text
    • http://vipaviveza.epizy.com/jotilipaluzabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f61f963-d981-45d8-a296-5b4383588d60/honda_shadow_1100_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfac1362-ba56-40bc-8bce-a1a0ff78c09e/90512321611.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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 6064 bytes
SHA-256: 02331913ec9f28db153583d358fbd5504cebe8ce9f5eae1c9a4f2644170a2227
font_01_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 11300 bytes
SHA-256: 37e9a3e0396039f6ace777ca19ba8e81453a596c47710454061fc3cf05269006

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