Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bdb59c19b5f250…

MALICIOUS

PDF

91.2 KB Created: 2021-09-10 02:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be6a7a61ccc995aa3c7bec290fd0153d SHA-1: e9fb85197c39a0700f35c6a6e4763e82efe56786 SHA-256: e1bdb59c19b5f2506f8927724e9f622455b5f32355fbc6e6575fa580859a5f9a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. This suggests an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://rajakeempat.com/contents/files/56644786074.pdf In PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/86873178006.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/wimipulebu.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/duboxudizufetu.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/muvegupodazebe.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/5230323142.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/24295980819.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/bowigapidumelu.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/31333267455.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/62383870204.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/xumitaxuvujate.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/44578409681.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca947caec---81489541056.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/muborewapuxijoxibejad.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/zupeke.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/89986378851.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/nesoxupafivi.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/tetabodubuwex.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/gupagevufavimapekomaw.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/newulinumutefikeluzovet.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/juvexerokasebunel.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/gitok.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff62ce910b---fovokebetag.pdfIn PDF document text
    • http://aprt1day.ru/file/40466068426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=redmi+note+9s+releasePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 19620 bytes
SHA-256: 68805c307afecf4841c2b9889711b07347eacf56fc64c7970b60d4749e210f5e
font_01_sfnt_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14786 10620 bytes
SHA-256: ae68ce0e5718662c088c740fb5f00d6998458d44c925f93d9172b57771e2d7e7