Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f61a48cad1aee9b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-08 16:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8df8fa1d9496c5c45e51015472960b77 SHA-1: 63d29099d51790e1d0bb42c19a4386043e144d73 SHA-256: 4f61a48cad1aee9bd2e8ae4b7b519a3f02752ef5cd87364a121fa61a47bb1dbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. The embedded JavaScript is likely used to obfuscate the links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a79c7a1df---marigasujutovibufezeregi.pdf In PDF document text
    • http://jar-ted.pl/file/kokimebalozot.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/jolerakutezisademelez.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/9314471924.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/rowedikikulepebamanu.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/mulofologukamur.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/kadatoxosis.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/wokasal.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/ludozokapegutijizukati.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210905214919.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/32288031878.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/dugusivaxiliji.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/linomelolukakudipuzon.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d0304b15fa71529d5add343ac8f01213/60335447920.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/93042290090.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/wimepitasobaronabi.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090218562651.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/68136122582.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/64472770833.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/28701398236.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/12396830197.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/8413941973.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/tefubesikixujavaluguwab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=codex+gigas+copy+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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 15560 bytes
SHA-256: 97611234a5e247883e82651a2a454f190bd47fb7b3172b312258c5b649485cf2
font_01_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 10692 bytes
SHA-256: 1d7e28a0a66d084af6bde609814b505dacaa00c4d754e2d9715c458539f9e645
font_02_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1