Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a323fa1a7e943f0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 01:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b99ae7ba67ef8a28a4f35d154c0f6893 SHA-1: 330016fc4ff4f4171c6eb89e1a1c03fb3bfeb066 SHA-256: 9a323fa1a7e943f07bb823d2ac177faae96d125a247f5efd6bacf0fa1a74137c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm with numerous embedded URLs, many pointing to PDF files on various domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/44476303424.pdf In PDF document text
    • https://hiroyoung.com/data/files/sijegipezejonojoribo.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210911071714.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/sunagoguzix.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347b57b80ff---mezenuwizolakozebeke.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/ripozadijo.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/42304319878.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/masunewalezedigaralebibe.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/4075150156.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/14011917971.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/fevixuwazulewef.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/98970741845.pdfIn PDF document text
    • https://diphong.com/uploads/fuxawisi.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/wexumujanutoxofuf.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/12119662033.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/75099553293.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/sozopo.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/33690145702.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/vizifubibonuduvotosiso.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/pajusow.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/1695008297.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/ranesomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+infinite+fusion+randomizer+downloadPDF 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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 10852 bytes
SHA-256: ef963948af4ff49e25b540a0b639bb511cff8b79a99da3679c3ef54ced14a1e2
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 17612 bytes
SHA-256: a93f00fa8a3f3cac212b592a0d16e079e23161910660b747f1c62d6610f6c52f

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