Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cd2c44fe5e90f2…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 05:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 132cb3f97983dbc6b45d430fa239908d SHA-1: 8b63c4feb38d9f3ad3d32e1130252ed955f78353 SHA-256: d9cd2c44fe5e90f2c6ed2ecd6167fce32d581ad8ada720a8d568bedabfe73b1c
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 a large number of embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/serojeduneke.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa945439d---ribatotokeme.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/rozadazuvijijuresopakeku.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/vuzik.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/moravemidevirowem.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/kesugurifurifati.pdfIn PDF document text
    • https://jobtiara.com/files/files/32930813557.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/sirorozetinu.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/gusiwuxasov.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/73848895597.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81328440322.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/68004023082.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386315a8c1a---jogesigukose.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/39271380745.pdfIn PDF document text
    • http://caythuocnam.org/images/files/jevofogizo.pdfIn PDF document text
    • http://renknh.com/ckupload/files/lukulekijo.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/65037992531.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210903055338-zimukefitozobewamatape.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/bokategizig.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/79047470893.pdfIn PDF document text
    • https://pisausakti.com/contents/files/9037719750.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1aeeed2cf---jemuvaluromamewujuzifut.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/47190634852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=high+graphics+shooting+games+for+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_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 17048 bytes
SHA-256: 9e05ebef238dcef453ea6bed63324ed6709ed9f06e930673a825230ec8de8016
font_01_sfnt_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 11012 bytes
SHA-256: 77505d2724e452a6532828c144e02d2df1242780deb897e7286129f151b3a67c