Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ae98144473a44e…

MALICIOUS

PDF

69.8 KB Created: 2021-10-07 18:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 52f9d34980bdb8a589f8a0e97acfe8fb SHA-1: 30b7614e64de505940068bea195216f19d6c4192 SHA-256: 10ae98144473a44eb3a0df69364304683fbbe8e0fd33a03afbefd9470e1dfc3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://joyandwowbook.com/upload/file/35892047196.pdf In PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/8817026372.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cf449c7824451b6310c970c5f2bec4d9/61713731945.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/serowemasiripok.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/86459470263.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/87208511472.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/netebopidazinerutenobif.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/zifelivevibajojomu.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/25518721655.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/36971768895.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/65543264958.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xizepoloz.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/powavafowarifa.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/62296338286.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/lilidejuwuwutixajirebalo.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/malukiluroreboxoxi.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/74953089084.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kisadifurogif.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/megexutofaparoxumo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9aba8f0aa57e73c9dfd722ea9ec2b99d/delesubalipepevuzawimoxi.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/gariv.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/52836540083.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/52198661030.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/30245516387.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/70393564436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=example+of+social+interaction+in+sociologyPDF 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_off0000b38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38A 14488 bytes
SHA-256: bd4360be5a42cfb7a9747483bd76944f2c22ee31dcecaf827185b9c1cec81e61
font_01_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 11020 bytes
SHA-256: f173aaced405b772297ac60af79245d5d0fcf565f66fb8536910166b7e35f39f
font_02_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1