Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b75b36b9200ad7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 12:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 34479f6e3151fa4bc783cbd1fe395139 SHA-1: aca91b0c6985f611a5e3bda40bc25f9d0bcf2f96 SHA-256: b4b75b36b9200ad7ef17e9cbbf96906a546e0cdca8210b90c95618cb43dfef07
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613833f3b8801---5637850726.pdf In PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/wurenopil.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/43653341824.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/38071866668.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e0128466---10226077226.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/wulepanapoz.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210910154303.pdfIn PDF document text
    • http://ipllaser.in/uploads/96153452209.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/fojemopixufelutiliri.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/7401276582.pdfIn PDF document text
    • http://aromata.ru/upload/files/konadanugogikaz.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/26903167040.pdfIn PDF document text
    • https://bloc-immo.com/images/tadokojolekumutixoba.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109041838551920.pdfIn PDF document text
    • http://charivne.info/images/file/jetuvonuxinewedojofugo.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210907_165800.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/3039429158.pdfIn PDF document text
    • https://bursac.net/userfiles/file/livipolerem.pdfIn PDF document text
    • http://benly-carson.com/product/files/xujukizutexagadufisopug.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/lijosifunisave.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/51436198311.pdfPDF link annotation
    • https://ratosatu.com/contents/files/mulamanovisetanudagusero.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/36859849723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gsm+installer+apk+downloadPDF 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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 17784 bytes
SHA-256: 80e0c95861bc1188173db3557a7f45f3c0d71a3fff9be9f148684538e95c1918
font_02_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 10768 bytes
SHA-256: 1fbe878b350e9b5afc5a3c35ad7c3e09a8ef975cb56bc638da3537ddbb2a98b4