Malicious PDF — malware analysis report

Static analysis result for SHA-256 742091cf412644f1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 10:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc9b5ee3f5df330760bfd4a5febd4085 SHA-1: 0c0f2860e3c9df13b6834befdbc94323b1d4fbb5 SHA-256: 742091cf412644f18725ecc262ca36af3a15d529898cf7c6b1b6a561e7aa5dc8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are classified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.pzkexie.com/up_files/file/96317219391.pdf In PDF document text
    • https://035620126.tw/upload/greenkitchen/files/povopavumuk.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/91401496870.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cff083db70f4d049e299d3e30af7c4df/56532813280.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/30617990628.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/sasekusexetakuki.pdfIn PDF document text
    • http://sun-eko.eu/files/file/botit.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/40662539134.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/tovakipewivi.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/ragisupugapunokusadatezo.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/73371774548.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/wodoxol.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/71997560559.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dda1e946da---kulazuwuvixaraxomikuxeli.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/17120238798.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/91558931216.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/musomumo.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109180747211014.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/tefewemokujorex.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/94392604004.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/83449397252.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/mipazukapuzipunamofijux.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/23003416413.pdfIn PDF document text
    • http://boardmark.com/files/file/xesazepevewafor.pdfIn PDF document text
    • http://slsnn.ru/content/file/daran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+ball+z+tenkaichi+tag+team+mod+androidPDF 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_off0000b12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12A 15968 bytes
SHA-256: acbe73355ae53c22e59c18b9aba7e661202b40567c596b7c625e7c8b8aaa58bc
font_01_sfnt_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 10940 bytes
SHA-256: e312dba0bd6d3e203b45faa75d785296dadd3dfb45152c0601f2d0b0972c6167