Malicious PDF — malware analysis report

Static analysis result for SHA-256 732112392af231e6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 11:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdc95d12f6bb2188b75ba916ae8c35c5 SHA-1: a6c55e04f773b2bf5044a49dd4fd07f054f88ed3 SHA-256: 732112392af231e61e7e2a6922e73c11b79fc15e67dec8733b5bf338dd76a524
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the PDF structure itself point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=android+delete+file+from+sdcard+programmatically PDF link annotation
    • http://nhatrangpalace.net/app/webroot/upload/files/xeruxewatigikesugumipuk.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/wuguvinobowikoda.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/59161185464.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/wimiledupukojemifukib.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/41468711176.pdfIn PDF document text
    • http://ux-school.ru/files/files/80325535059.pdfIn PDF document text
    • http://abnicum.com/files/file/wijowekize.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/fuvemofox.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/20978503245.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/v7fqkpefmnpdro37j7bjt69hd7/16656894895.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/xomufali.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/voperibelifagedigusir.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b07acb88---putavab.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/7606554291.pdfIn PDF document text
    • http://vititanon.com/user_img/files/48791203351.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/fokanijarajarinesok.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/merugenorezazelojitetom.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/pilit.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/85674533852.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/12112074033.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/5257707907.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/2163654153.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/45409492236.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/nepikodididi.pdfIn PDF document text
    • 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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 11056 bytes
SHA-256: d51b474744787b40dfb2acc61ebaee250f0955d9253764293f631e381f2970c9
font_01_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 19488 bytes
SHA-256: e4f4edc38c6e7d7719a49dea4f9cd59323a6e686d0ad7188c1fb33adea8fec15