Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6b2c48d2f3850f…

MALICIOUS

PDF

87.5 KB Created: 2021-10-30 13:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c5b0a9674710c14a05b0088929ad55a SHA-1: a3db184f5046e6ceec50f56c36dc315c30f58477 SHA-256: 7c6b2c48d2f3850f1253f490781bb1fd4094375158820349b3766e58a4d063fb
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://contemporaryteas.in/admin/uploads/file/gasupebopotobamof.pdf In PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/81214209880.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/28198010708.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152031348a04---wizotaviwepivuwo.pdfIn PDF document text
    • http://klenderbio.com/upload/files/39636724143.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d065c064---16089140371.pdfIn PDF document text
    • http://egitara.com/upfiles/files/40841880799.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///peralanadosexogapanev.pdfIn PDF document text
    • https://nesselaarbestratingen.nl/plaatjes/file/sozevinilirigakovaso.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/57295357400.pdfIn PDF document text
    • https://unosms.us/userfiles/file/nowop.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/zanebuwapifuv.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/jukewaruforinusote.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/zimonomutiw.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/17033204359.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/ropubigitoloteb.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/wolevimiwezepevogidu.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/80768552811.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/9549713057.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/68265308468.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/zisaxuvepimarub.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/gotetilenapifafenawojifak.pdfIn PDF document text
    • http://kes.org/upload/editor/files/xotobugamavawadenit.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/towenuxubu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/5bhJmFgkeCE/uplcv?utm_term=the+evaporation+of+water+from+the+leaves+of+plants+is+calledPDF 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_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 18144 bytes
SHA-256: 4dbf7c78c2e9209239e1077c6f563f0bf4b68d1ce27a4252747206074519aba5
font_01_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 11000 bytes
SHA-256: fc8869a36749a7735eb2d6bd79219ef9986a7d326c6cd9cd62524b07c469ac4b
font_02_sfnt_off00013760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1