Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83aaef1a800c680…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 03:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5f46e59d94e9c2fb746e1a37cff8101 SHA-1: 6908a919fefcf334e9a001fc13e8db1c6da5f85f SHA-256: e83aaef1a800c680f5d6ce0d43adf3cb21e9a005331ad42e56bdd3f51c7c4f72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4e09b79b01a1488227a618fc61fb73a4/37747804470.pdf In PDF document text
    • http://dinobajka.pl/Upload/file/befiwiku.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/xutipoz.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/duraka.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/waxumasixibirasef.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/35579086172.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dekolatagaso.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/mavotematuvagikura.pdfIn PDF document text
    • https://kokomanis.com/contents/files/zugezeka.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/80024741877.pdfIn PDF document text
    • http://4bx.pl/public/file/luwawefumeve.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/11036780958.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/39116700987.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/31712543954.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/11644361200.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/32644174979.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/39900541882.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/srvgj2a7pjcoim0fqgotn147ju/33743309622.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/79654412465.pdfIn PDF document text
    • http://ropesadventure.com/d/files/kibekajufadew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lire+video+sur+androidPDF 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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10220 bytes
SHA-256: 2e4b6362db35e54ed0fcabe85ea252d029e0bd6e48887dd3068b2c65f5083a6b
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 19272 bytes
SHA-256: 7a8c2d4a617d839cddd4aff662a9a2d8dba46491bd10a19fbefacd3542a3db38
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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