Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5db5e0d279bc37…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 02:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dda832f2e2aebf07df814846713d0300 SHA-1: 8038533f987be20e810c418327933800fb15bbd9 SHA-256: bb5db5e0d279bc37f7194ccf85003a9f92a5258362126528e13c21f042d91acc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high 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 exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://pixomot.ru/uplcv?utm_term=beautiful+words+that+start+with+n PDF link annotation
    • http://ge-mak.com/files/vupogo.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/18431879250.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/masikavojofivikoze.pdfIn PDF document text
    • http://web5gstore.com/Files/files/jafoxok.pdfIn PDF document text
    • https://securitydm.net/slicice/file/90167385526.pdfIn PDF document text
    • http://kes.org/upload/editor/files/45742687330.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/lesodefesusute.pdfIn PDF document text
    • https://unitjaya.com/contents/files/13989503708.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/jikazuraxiwuwu.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/fapitokanalabapaxidut.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/21393801964.pdfIn PDF document text
    • http://cobmedia.hu/include/vemap.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/buzonadesexezenakowebuki.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/8927950242.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/pevitusaginubasizub.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/5226810566.pdfIn PDF document text
    • http://innotack.com/userfiles/file/kifikezinologu.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/sazafulogewiro.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/basuwo.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/8812203979.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/mivurakejitu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0784573af---wufopu.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/30905217252.pdfIn PDF document text
    • http://trevorhannant.com/16911748037.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf7816b56---81506884411.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/62088223827.pdfIn PDF document text
    • 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_off0000bad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD7 10688 bytes
SHA-256: 6ce3c2d9e791d62d5e5863c72d8cfdacdb2f1a46c1c68577dd4b28a20389be3f
font_01_sfnt_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 16296 bytes
SHA-256: c88540c2147720d0af34cf903940d70ab521dfb6d719270ae81bd2aaee9b6775
font_02_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1