Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc9cd42cc069b99…

MALICIOUS

PDF

102.0 KB Created: 2021-09-20 23:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f45bd7a50b57d269a03b5f2300b9b7f SHA-1: 2200a86932fa17724837447087237f07cc453351 SHA-256: 6dc9cd42cc069b995d47758ee2e4670e99dc36c2d4753e91b0313218c609b414
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 part of a link farm on disposable hosting. 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 exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://jump360.co/upload/files/20210911054325.pdf In PDF document text
    • http://qunjl.com/userfiles/files/bajodawukemikefa.pdfIn PDF document text
    • https://fultoys.com/userfiles/tatetoratigefoga.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/24600953664.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/27920960148.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/kowidanipiwum.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f84bec01006f503abb01c151f8113895/riredenukigigu.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/kisomivopusezem.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902054413.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/58676959744.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/rugojakupoka.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/sogufokixuso.pdfIn PDF document text
    • http://synergyproperty.com/images/files/69758624554.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/xusiruxekedasawofapiweto.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/vimemoxewakudafefixa.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210906224533.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091115342778496.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95f79506---lusezaniga.pdfIn PDF document text
    • https://loyd.rs/images/file/merelukegalonajelowiwapix.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/vamobakow.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/vufedafe.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/12213753899.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/44847083536.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/30456991715.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/lofujenafuwevut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=background+noise+removal+app+for+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_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001379e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 11176 bytes
SHA-256: 0af477411ae7c6f53fafdba8d05f5c7b2df41266dd139dea11d39cd08bbb13fb
font_02_sfnt_off00015194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15194 21424 bytes
SHA-256: 3790d84a18d24df5f1edc3a1fbb794eab0a319909eafb4e7ed3ed8ea7b59c24b