Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62de51ea5abb8cb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 00:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e45be62c269f6f84d69980240c737c07 SHA-1: 07cfe967a5534244bd1eae0605aaae099bbc1657 SHA-256: e62de51ea5abb8cb4dc4c4df06031aec4890e138093e596c6fb62fd6e77532ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=best+pencil+sketch+app+for+android PDF link annotation
    • https://sooryasales.com/uploads/file/12489098747.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/87462850312.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021092216323092711.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/40384064226.pdfIn PDF document text
    • http://ymmicro.com/files/files/92154800819.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109140044275110.pdfIn PDF document text
    • https://digireg.com/upload/78283391366.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/numasukemalebutuv.pdfIn PDF document text
    • https://dm288.com/slicice/file/76442404285.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/64702541705.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zulam.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/36137132342.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/14913147913.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/sefigulofun.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/jutisux.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fizojow.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/rupuvezifix.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/lalorematituxupazevik.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bipedejanazoso.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/29417460044.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/942877576.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/nulebupekadalovizaketum.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/66465216280.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c010a22ba1---97454921364.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/34128475716.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_off0000b42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42A 10864 bytes
SHA-256: 4c4e82497e109cb544c9bd5396deed7ab9185028d4ec94efd66d46aa7a6b3cd7
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 16880 bytes
SHA-256: 095ace607dec42167bbae551d29ff49b7769d063536d15d29e7ebb4eb9b18b3e

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