Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc68420d3c1e61f…

MALICIOUS

PDF

90.2 KB Created: 2021-09-19 02:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ebe2b1d360adb27bfed31a44ad56737 SHA-1: 577684a89ccab448c9322e37e535324f634bbfdb SHA-256: acc68420d3c1e61f04cb0b3d3c5761631ceb953cd175ec53431afd182d8511ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially malicious content. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest the document is designed to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=pogaru+full+movie+watch+online PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jbjsjv0dpotb08f80dsgctl13r/xanokife.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161380c1809297---doxevufilebokotizipopidu.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/29252192428.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/99424769135.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/49604183111.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/sexabaxutiniwagojukuris.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/78339356827.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/zelinikujuxejigokavik.pdfIn PDF document text
    • http://rem-proekt.com/f/file/32105083410.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/15569988761.pdfIn PDF document text
    • https://aashianarealty.com/file/nuwaketa.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/waxem.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/49682134325.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/84667793250.pdfIn PDF document text
    • http://nenorm.com/files/files/22339064711.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/66052923656.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/mugigogofupogebonekejo.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/fodipepames.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/61042246276.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/40389214746.pdfIn PDF document text
    • http://chinahongji.com/d/files/83707405265.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/popokuxepopepidaperadubaz.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/92746418100.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/bidojufipimozofepurilo.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/76851428784.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/57069048343.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_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 17596 bytes
SHA-256: f3345fa9e92bcbcb3153fe55d3af50894b0debff34413bfc25531a98096de254
font_02_sfnt_off000141f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F3 10868 bytes
SHA-256: 70b2e8992ab2f554d9b10caec5116df61a9090915adec015ded880c75eb29e72