Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3d9cac9c94d84a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 07:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5088ee264bd9b1ce04c5d08f9c7acf69 SHA-1: 355e9debeaa7fa0e7117a36624141e65ba7acd73 SHA-256: fb3d9cac9c94d84afceffffbdd58773db827086f36920903d9c4e7b810ff2fc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic specifically identifies it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an intent to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ayurveda-shiatsu-qigong-nice.com/upload/files/wanor.pdf In PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/70059969531.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/33310849787.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/fowugibefagegoro.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/xabemi.pdfIn PDF document text
    • http://hidropro.hu/upload/zonosamotipafijefikoso.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/nawexizokisupubab.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/zokalefokusus.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/morazarimatawizetu.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/pepunixizugazixewasunas.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/witavidixojo.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/69640901113.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/timisafevajumilujo.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109192313482610.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/2284169405.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/bijinodexox.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022542.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc78b8d75---bemidizukafadowezodad.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/59286529801.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/40555638597.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/44575755898.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1a0ad503---mofimexurisusasil.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/19635545723.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091101462873499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=easy+viewer+pro+apkPDF 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_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 18516 bytes
SHA-256: 70ae503d8eb80eb9e26666d0db19c25362c2b7679d804b0bebea2b77ed39d61d
font_01_sfnt_off000115c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 10340 bytes
SHA-256: 1240fd87685210c61cb8ec71e5af664ac41526b6454727e61d1ba0d136fb82f1
font_02_sfnt_off00012d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1