Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7294458de98c64…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 06:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60ac5d1116d6a789d8bf885e48b908a9 SHA-1: 8fd45b834175fa4f38d51e85458a2091174e0c1a SHA-256: 4d7294458de98c64e9ad636065eb3ebf34a4327f9090835875abafc74b4bb847
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, 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 related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=mx+shareit+app+download PDF link annotation
    • http://nbkhjc.com/uploads/202108/file/210831223026314680egv19n8nikis.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/70956110797.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/39652016765.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/wefijawarepufogosolu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8811c15da696f76ab3b13056f5f7c9c2/85851788536.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/75184842747.pdfIn PDF document text
    • http://goldmustang.ru/files/files/nodat.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zodipagojolozemope.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/35040220227.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/8923907324.pdfIn PDF document text
    • https://rinducm1.com/contents/files/83839799840.pdfIn PDF document text
    • http://azizolace.cz/images/file/saduzewu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///24981469581.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/96978017820.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/37806658496.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909110352.pdfIn PDF document text
    • http://elskenecologie.nl/files/kinedujonusujesatiju.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/61941938200.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/jomafewemamurijosil.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0b50de3d---zixevaxesef.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/palumu.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/97802405041.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/93819733059.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/30283992621.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210907_A2CC9F4738FF6BFB.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_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 18212 bytes
SHA-256: 67652bc20fcc8988c5e8fa25495f14b58ca8657151c23475d8e88c23b29d07c3
font_01_sfnt_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 10668 bytes
SHA-256: a25f0e0e7d5ac54bef70fb2245938a69a7afd91eca7227a0e0add79fc4d5b235
font_02_sfnt_off000131bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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