Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a61a1594b65718…

MALICIOUS

PDF

96.7 KB Created: 2021-09-08 19:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a67fc4bdf2290025e92e908d1e6267e1 SHA-1: 4d52a93d470db7bfca2f5b59d32c1cc7b008d855 SHA-256: 39a61a1594b657188362e7d0a1694b88aff513dafb119f4da688da18aee4dcdc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ghadir-eng.com/userfiles/files/1712028332.pdf In PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/vebotigukipofezopuja.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/milizuvivunadet.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/pedav.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/95810067633.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/mazixikixajixol.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/34341035174.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/gowaburadadekabijodepu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382605921ad---degebaborewopiwuvut.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109080849537950.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/23263132754.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/7036404349.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/jojoturagekujolupirub.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/velugunusek.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/9289774850.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/zagumera.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/94026433498.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/44598568226.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/50730901754.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/valuvejasijepesetijas.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/29534714808.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/datiritodefixixijutima.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f555bb4cc2---runum.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/mezurixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=analisis+kation+anion+pdfPDF 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_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 10332 bytes
SHA-256: a6eb9a16517ff2e446ae6df3a82b6ae7cd0d15362ba44c391a233004bd9361a0
font_01_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001479e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479E 17644 bytes
SHA-256: 564b31a346b24dd061c5ee8b4bedd71698d93a128fad192f42eb65cfe52f7371