Malicious PDF — malware analysis report

Static analysis result for SHA-256 47341461013d0161…

MALICIOUS

PDF

72.5 KB Created: 2021-10-11 05:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 63a930599d6eb92dd90ae970510e2ada SHA-1: db120de5bfb4f43678c0e15acd90656c5003ffa5 SHA-256: 47341461013d016128ead998df4011b9d4a15fc7deb80a8e85add6379f393510
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dentalrud.com/userfiles/file/vopunagojomanimizafaxizo.pdf In PDF document text
    • http://alacartedesign.de/userfiles/file/10935028907.pdfIn PDF document text
    • https://tobikam.com/userfiles/file/93952346694.pdfIn PDF document text
    • https://terracell.pt/images/file/12235087489.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/jirar.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/84881545665.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/72880023783.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/88179495167.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc84bcd347---69293817756.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/nabor.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/paradojamaz.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/wuvegezududifejamitefovu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/furomeliwakusuximadali.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/30325808023.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a989ebe9a---jawizebigawetimabe.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/sifujerodemifikunozuzes.pdfIn PDF document text
    • http://vititanon.com/user_img/files/70281882595.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/72936647218.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/30504637004.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/97365437001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=maths+paper+1+solutionsPDF 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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 16800 bytes
SHA-256: 309b2d4bf092194f4c45780a4fc2bcade439596b4905c7d9089cded31e345299
font_01_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 10496 bytes
SHA-256: 2993a83281caf4f82de9d0b154d0b6f2e0c670c6ef6e7d7d2df252f861b471e3

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