Malicious PDF — malware analysis report

Static analysis result for SHA-256 f020235ee0f5ea04…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 12:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08f49a43136605ca761b025755c721ec SHA-1: 47acaf87ceb6faeeef5fc060078a3a29d8315441 SHA-256: f020235ee0f5ea0416b4c1a25fb9a072373b4274d315d54c6455a3bedcc626e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://haisanquangninh.org/data/dulieu/files/lirur.pdf In PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/fanemakatonu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903101819458630.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/73890175890.pdfIn PDF document text
    • https://atrax.hr/files/16316804102.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109072301434736.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/77080330680.pdfIn PDF document text
    • http://bamila.vn/luutru/files/piwubimafizexekesutifamij.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/73579269139.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/nopapiruk.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/10605875909.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/guvunazutobani.pdfIn PDF document text
    • http://favourtec.com/attachment/file/76460749439.pdfIn PDF document text
    • http://sartor.ru/upload/files/21397906855.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/62226452170.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/sumelozitufekutugigutu.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/regaxefek.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/bidujivo.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/somapamex.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/23378010753.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/87052406677.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311648ab5d4---51912718650.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/gepivaxofomixalera.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/lemoxowujenuve.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/57553897859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hotel+operations+manager+duties+and+responsibilities+pdfPDF 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_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 11072 bytes
SHA-256: fa6b856d700838e2a35a0f934083c1470c8220d81e838221c0ac098e801e6046
font_01_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 15012 bytes
SHA-256: 58a6a1f0772c6c9f89299f6f140167f539e4bb232c9ff27d3a18501ce49cdc6e
font_02_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1