Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f7f0c23dd4aa42…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 00:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7289490e7d824982889d01717d56844c SHA-1: 175bc8ac2b445be2243bba6848c8a70fa8a3b32b SHA-256: 68f7f0c23dd4aa422c78d4f680bf1bd6f758a93e8f7858220036887c9a3a58b2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=how+to+know+your+own+wifi+password+in+mobile PDF link annotation
    • https://ultralloy.net/upload/files/82881589652.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/nuxuwar.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/pazexosikekavoxixaxovik.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/44637215322.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/zosejewodixudetoregaja.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/91883310436.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/ririferifufiwogofunub.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404f3a175ed---famelolinuxunupalosiba.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/75273518932.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25022366327.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/pomeletatoge.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbec636ec5---bavaxosedefojapon.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/68026160143.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/sarazuvewovepi.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/38458091601.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/46889835306.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/40662539134.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/birelogoni.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/59318277821.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/zavixelavugepi.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/86796013163.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/dewibojenetopokusi.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_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 11180 bytes
SHA-256: 53b72ff909f1f752265b976d706cda489fe22a0dc240da5077b9ef0e10f27120
font_01_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 17216 bytes
SHA-256: 03842427434b4fd3e72e7f61b7707b3cabe767aa25d27a14d5e634b4400da999