Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aaa15a055ec883…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 05:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c01dcb229dd585bf926a6ef3797917fd SHA-1: bde9cb8efac03c18f3e88400ae8779f4fc099c90 SHA-256: a5aaa15a055ec88308a70a4c64b5fc7505003971f1941fcc7c01413c73407326
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites or download further payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=best+app+to+remove+background+noise+from+audio PDF link annotation
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/27724647719.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-9/20210909095442450930.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fffa02cd1---93407981757.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/xelidisixuvozisamowunawum.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/99231249223.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/44186515386.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/sasun.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/tixijusagemesuvel.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/musadukibagagozul.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jovuxefimubamopoles.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/xepijup.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1mqfanvq5t4sdhk5nda1uqcbhk/kubajowi.pdfIn PDF document text
    • https://questyme.com/userfiles/file/68377557437.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/potonibo.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090712103_894742907.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuruwus.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/xejakeraxelu.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/85739096368.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/5888422771.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/sugagigowoneviforulimike.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/62419871903.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/13237107672.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/14240813226.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/22586496532.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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 11368 bytes
SHA-256: 06a21a4ba1a073020e442221efc87cd536f3bf882f2d34ceac0461ce252a50f0
font_02_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 17932 bytes
SHA-256: 75c88a01ec2f9dbe78635de48f80571da37da9b867841663903aefc4997e8d8f