Malicious PDF — malware analysis report

Static analysis result for SHA-256 9589beaf29fb3e3a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 17:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 451c8ce36f67e9cb38c8ac6e9ba472b3 SHA-1: a249c72ad45ed836bf6fe5d036c6807353233ff7 SHA-256: 9589beaf29fb3e3aa3845262ded64f4028ca4f4797cd0bdd862c3607c45f208d
166 Risk Score

Malware Insights

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

The PDF file contains multiple heuristic firings indicating it is a link farm hosted on disposable domains, designed to redirect users to other malicious PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://keemunblacktea.cn/uploads/file/061937222993.pdf In PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/zekuraviwukujaj.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/68959453628.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/vibududugepalomiwa.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/66708808186.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/tepaxelutekanakevewosob.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/70987952137.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137757b32edb---2748687732.pdfIn PDF document text
    • http://dsfly.com/uploads/files/44538516630.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/11612940646.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109080247058293.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/zetopute.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906230416503.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/9724048395.pdfIn PDF document text
    • https://edex.co/userfiles/files/8834071938.pdfIn PDF document text
    • http://ymmicro.com/files/files/mokejar.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/76428204103.pdfIn PDF document text
    • https://istanajp2.com/contents/files/31000778731.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/wisugofasetuka.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/bisikajujubuzubiwivoxe.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kipubinemi.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101831377411.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/zunijusiko.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vi4395hbpcesi5f634ci5h4tuf/zuviliju.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fupagozevof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=miracast+server+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_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 19752 bytes
SHA-256: 189673dcab0bf16621752951e72de792b5172b96986b31a0165370805aa41f18
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 10248 bytes
SHA-256: 674fae4305ab65ec3f44a7524119287f037d1996e3da6ab098b0a59f721ec2f0
font_02_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1