Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd58597eded3650e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 19:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bcc1904e207fba1049f04fa52509699f SHA-1: beb4697dbbc31ec15bec561edb0d76b8861206ac SHA-256: dd58597eded3650e8885ee96f5f8a7987d1785e85c17ee7ac2ae6656f4939967
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest a phishing or spamming campaign, where the JavaScript likely redirects users to malicious sites. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jedzenie365.pl/ckfinder/userfiles/files/pefimadizenunoxemefatu.pdf In PDF document text
    • http://3e3i.com/UserFiles/file///maremaj.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140d25bb5802---89899382346.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/vurunoxalekizogumibak.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/femifegepozo.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/99089496667.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/42136608289.pdfIn PDF document text
    • http://leguido.net/files/nafalolefozewusizo.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/josemuxepibudisuzunemib.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/53476924868.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/52661697183.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/25186273985.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/64074534597.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/73640059810.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///fipigo.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/12676296986.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f4dfb0f223ff67610b35087112b11063/vagusomexedunozusat.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109202149133937.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/latij.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/torowugalorukuvewir.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/geluxofokef.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/gefudowexarixo.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/13757803919.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/54993656376.pdfIn PDF document text
    • http://zegaoyun.com/calisma2/files/uploads/sosenoxuguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+add+pdf+to+kindle+app+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_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 10492 bytes
SHA-256: ff45e6f1bc81d20a8a7d546f77024a50ea7af24231fe91f11a36dc7bf797f2af
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 17180 bytes
SHA-256: 0f1a7d4a1b7e8056a054a9079af4cc7ce9e8eca2f6aa37e2e325a8c44871b731