Malicious PDF — malware analysis report

Static analysis result for SHA-256 08aae66c6533c951…

MALICIOUS

PDF

87.6 KB Created: 2021-09-14 06:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be76e7c3e7d5b433cf05ac49199450bd SHA-1: c50d76eb20402044b9e72794768ba6ce610f11bc SHA-256: 08aae66c6533c9516d1ee9d78bb1900f693d2c578c517c6928fe617b96f885a8
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous links pointing to distinct, potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://arvikabc.com/images/uploadedimages/file/88692729112.pdf In PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/40621446265.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/95136192408.pdfIn PDF document text
    • https://tipresentoio.it/images/file/masaxedofura.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/buvipimevunisojetevof.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/sugipefuvuravi.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/nadogipotobesedefovala.pdfIn PDF document text
    • http://beiks.info/public/file/8830168412.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/77919155416.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/39555944644.pdfIn PDF document text
    • http://rotang.net/userfiles/file/66835650589.pdfIn PDF document text
    • http://temple.mo/userfiles/file/lomojejegulekas.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/5909394607.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/sofitir.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/xaweke.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134808edfe88---kukogituresegatezijag.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/wekukan.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/32090851200.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/21712538742.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613a76b004c5e.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/72272068509.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/motisazoxinumovidukojup.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630551086.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/55909580785.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/purapodoliniladaxuraxik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=name+all+bones+of+human+bodyPDF 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_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 10660 bytes
SHA-256: 1a80ccbf64728236f9f30eb462a2fc1d3652426b1afdd1cccca9d7a3abadfb47
font_01_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 17580 bytes
SHA-256: b690016c5f4330b0352d6713fddab1c9ef1bfb38e1946ca04779cae4d89737b7
font_02_sfnt_off000138c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1