Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c55ea350e7ecf73…

MALICIOUS

PDF

79.7 KB Created: 2021-10-07 02:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aec94349476d147f3865aabb82a95998 SHA-1: b42ee76baa5764e76712bc06515739b9ce9051e4 SHA-256: 4c55ea350e7ecf7310c4f925c153fbab5e87d889e3d66fcf4abe3f231846599a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, one of which is a PDF hosted on a domain that appears to be part of a link farm. This suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://sunriverps.com/data/editor/file/sodoberuvesevererez.pdf In PDF document text
    • http://fmdscu.net/userfiles/file/35513651393.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/zebejibawan.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/taduf.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/79870351027.pdfIn PDF document text
    • https://red-adlay.com/upload/files/mufug.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090812041173499.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090500545773499.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1f57667c---senomerobimikiw.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/lamikefiluxuzomisuzum.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615033992c36e---6385623758.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/46705899673.pdfIn PDF document text
    • http://grafitym.kz/files/file/wixujisuro.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/jizej.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/88482156828.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/vifinaxebizo.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/wibuxizedasaw.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/26437326316.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/67211291935.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/litenanekivurevuxewiratov.pdfIn PDF document text
    • https://veriniams.lt/userfiles/file/48862225805.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/viratofenidato.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/mavukikib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=medical+and+dental+expenses+schedule+aPDF 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_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 10588 bytes
SHA-256: 27466a110f9dab666376ba9e1814ab791ab39d6a9612375cf0d8987543980395
font_01_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 18688 bytes
SHA-256: d8a79e9f1df8cd9a8fffda04f085a3777ce15e35326462a49f6e53c64ce748fe