Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc41d683bbdcc249…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 14:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 246bd4558b81351fc96bdb3a9a80020c SHA-1: 2a92132f399492f9698c2e45edb06424298413b8 SHA-256: bc41d683bbdcc249edba0b3ad3e12e9b98cc75bc371064e7203cc62768303748
142 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 be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code, potentially to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=clash+royale+hack+2021 PDF link annotation
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dovebewigifiginot.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/52jeokreh4casun428meqaenp0/51712424606.pdfIn PDF document text
    • http://meditopthailand.com/file/luwojisin.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/3280417632.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109022115423183.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/piregesirazo.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/83782002941.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/zimuri.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/65947189415.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/67318486282.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/8047816982.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/turukuxupupukonu.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/50122738520.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614754edad872---bodevizotupemuzevol.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/womuratisumawodesidupet.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/34019445232.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/12539428208.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/vugimoxubega.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/50268150909.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/menoguzunedomazexe.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210920051432.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/sazukodijog.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/bofedebanini.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/lisepogasumesizapefarivaz.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/wazapoxefa.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_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 10564 bytes
SHA-256: c81d5f0b4738cf0fd1827225bab2a6c52cbb75e3a6ca595e7a933de5399742a3
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 18696 bytes
SHA-256: a68ab6322ce4c4ad2584d2f68f91b04a0c0f4c933ec84c9dc2fcdc268affa8b3
font_02_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1