Malicious PDF — malware analysis report

Static analysis result for SHA-256 7422c229e813d35b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 22:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 336d044c9e5086ee072230f502250cd7 SHA-1: bf30ce065484213b352f98bb4d686e31ec925228 SHA-256: 7422c229e813d35b32093e7db3ef6e0e41869e768dc20c7c536512fffe22c234
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://i-chat.tw/js/ckfinder/userfiles/files/xelenikiluweliso.pdf In PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/577724762.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/dapisutegimunenalevofuw.pdfIn PDF document text
    • https://koratspring.com/upload/file/99179477221.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/woforubej.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nanujagekaloragodepujo.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/benutivegigisasitiwemogor.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jupilamelam.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/70429611971.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/guzez.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/16743101266.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/25260700340.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/83148416177.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/fumiguzotokemupapofepe.pdfIn PDF document text
    • http://cobmedia.hu/include/viraditaxekutat.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109161058225963.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/94416407146.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/8004248675.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/sorufatonemufapuguzuda.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/tutezemafaranizewebedezi.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/65307157797.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab85e9c2c---jigak.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/guvuxetajobogulomarunedug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=game+hacking+apps+without+rootPDF 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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 17520 bytes
SHA-256: 49cd4cd91a4e4b21ce90027e74f615a7152db9b022983fccdbba0e98a01f7b0c
font_01_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 11092 bytes
SHA-256: e9bf0c77132ff837427d4f6510d7361aabf0d0dd308b6e741f7371fdc295cf23

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