Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a3685c674d5971…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 05:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f690617cc9173ba6eb0ae0a0ec0a62f7 SHA-1: 90bb8b7dcdd02ea7b6cbe8df54e1c1262bcf8c2f SHA-256: a0a3685c674d5971741e899bb33f27f6d2601dbb065a64ab5675d7e274058299
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 hosted on disposable domains and appear to form a link farm. 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 executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coniperfumes.cl/js/ckfinder/userfiles/files/73057744461.pdf In PDF document text
    • http://flexinform.com/hirlevel/file/430214865.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/sefolinu.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/30448316513.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/vogidi.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/rekiratojibuvorowabem.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/kewelowuwedetoketus.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uqmpqcql636e8ss1flfssu906p/40595025367.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/jefuwimamutuxifipovuf.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/35496123708.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/64605893323.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/92267002592.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/jomufimufezogesagafuredef.pdfIn PDF document text
    • https://manenshop.com/upload/files/lalijikifigupegarus.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/26984801325.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210901_A5C0B9D52E01496C.pdfIn PDF document text
    • http://dothi.info/images/files/gifulasaxekesidilur.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210910_532D9DEBFDCDD419.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/30746295685.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/julijijelusidejijunawaw.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/74680907396.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/gugeduzowapuge.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eov8tnpv9smrm9j89glak5d055/sekiwos.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/tonevamuvemefutax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=memory+unit+of+computer+definitionPDF 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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 17488 bytes
SHA-256: cb2a29fda2fc1263dfc0d23e09c6a3401e9ff33eabeb0ee24429bee7fa09a424
font_01_sfnt_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 10612 bytes
SHA-256: 2bb6c5bb78196d900810d2e9899a1700e85afbb00898714cdb9b171e2fa0aaeb