Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1967a34d279127…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 15:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1e40b2daba3e84cae60202b33382e59 SHA-1: a442c14e645d79eda34e1522c4c51528de6a7211 SHA-256: cd1967a34d279127e83c01bcd23064c904a80fbaa3b4fcfb9c4ee0dcd7cae121
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

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://gldbirdgel.com/user_img/files/82679837985.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446d0f1872b---34273538817.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/91149983075.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/87180537849.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/nekofedubezekuzezokir.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/vozadomopijuzibunorotot.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/66169187469.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/pezofefa.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/dozifasetirokifamifuril.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/71773606506.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/mapuzuronojirakexo.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/dujetitanevexali.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/wudejoxesazenexepi.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/mozatirekip.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091419012673499.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/7071883916.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/4459113722.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/povefuledate.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/wubijipuvikirivoto.pdfIn PDF document text
    • https://projetovm.com/uploads/files/zelunajiwonazu.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/popovepigujobis.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/finodumitakejunipi.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/tunej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=windows+7+iso+for+macPDF 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_off0000aeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB6 16644 bytes
SHA-256: 7e1de2d39ffce5bfa5e987af907cb880e930af8f5fb18a9703465873279f15a3
font_01_sfnt_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 10488 bytes
SHA-256: 138c0a2dd3df7110ac698c37fdcb82344eec968c6bfa2b77ba407c2a61544ff6
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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