Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1992ced12d4d0c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 18:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22222d0a7ecba95f4949a9182d355dc9 SHA-1: 1328ffee71641bb4e2857c3255a568fbd325beaa SHA-256: ec1992ced12d4d0c37a53f7a6d11279df78d0fe562eaa1e63012272ec70312e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one that appears to be a redirector with a search term, suggests a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=how+to+make+bootable+sd+card+for+android+tablet PDF link annotation
    • http://www.masozilina.sk/ckfinder/userfiles/files/9976172046.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/gobemoniton.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/78703015492.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/bidogikowesota.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109152200233561.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/xetovefogawejaxalopot.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161365d6fc8ba4---guzaxalusaletegoj.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/fiwizogarikurume.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/73497861749.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/zutizugorizilufime.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kanakezonu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1b4a0bdd---97513988021.pdfIn PDF document text
    • https://tpk-m.ru/files/file/jamorot.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/2557994090.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/loraxabixoral.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/765640435.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/narodomiduluwoge.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/47600027567.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/18086752894.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/kiruluzabonidafibeki.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/vemajabovovodovividoruro.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_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 17940 bytes
SHA-256: 62b6367ec46a4d9140630270a7fac93418d87e41ed646d7cf6a855d4578485e8
font_02_sfnt_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 10944 bytes
SHA-256: 5925a04dd670339e30fbfb42c4895f95453888a132cb6b60bc8f24a2451ba512

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