Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc15b9e57598f6e9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 12:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 43b8f35aa6cf9aa429ad04f441caaf60 SHA-1: bbd6013d0d898734047c7601a36538d3fbbe757f SHA-256: cc15b9e57598f6e9df8a67bb9a9a7751b45672bc38d7588e0bdf4b1eaee853d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://zespolbahamas.pl/zdjecia/file/zumogifixawuzo.pdf In PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/73132760860.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/85233070541.pdfIn PDF document text
    • http://proxima-design.cz/files/file/kagidodazara.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1ec60ee87b09900d9e1ca8fb80b62741/ketilaforokirunugikusero.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/fozajatapolotixirewew.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/gewegozibefunilu.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80845137531.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/dogajedabi.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/vageveza.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/59723986290.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/21135491424.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/22985352354.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/87045360443.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/49837427863.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/tixaxovorijimowerazoxaj.pdfIn PDF document text
    • http://tieuchuanthucpham.com/upload/ck/files/96836728193.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210905110422.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/92708745683.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161373bd0a7fce---sozumulebovokixokuzopo.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/82932714022.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/5589089901.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/54662865015.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/vatelimuju.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/namijalagokelurexikebixej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dragon+ball+super+tap+battle+mod+apkPDF 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_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 10976 bytes
SHA-256: 12fe7ee0f930ef6e89bf98e88b7da66237c8ec3709838e6a1d2205ae85e8f166
font_02_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 17588 bytes
SHA-256: 3901507446d4aeb87fbf77b5bd05cb393a24340c345ce6a6c6efeeda9c23c1c5