Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c174208d0989af…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 09:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec0149abf2963fb72983c93b305fd4da SHA-1: f702f798226a546fad374e02e0382735f624685d SHA-256: 13c174208d0989af6692110a7a575279204145e01b80b7ad8e41457486c454fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection for phishing and trojan activity. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to lead users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://altinay-law.com/images/file/44028148254.pdf In PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/17130605799.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/gogetewulumigipexowasa.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/womoref.pdfIn PDF document text
    • https://faceless.me/userfiles/files/17687403876.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/kunevetenudosinelof.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/buwax.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xusetozuvususafimov.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/91574004134.pdfIn PDF document text
    • http://fpole.ru/sadm_files/78704753378.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/74945615311.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/28668688186.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/ligufoxotujiwudifasovoru.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/84699866658.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210904175749.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/8581146061.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/vijufewujo.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/67840851900.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/najituv.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/gesibew.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210918_170256.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/75132291886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=smash+flash+2+onlinePDF 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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 18528 bytes
SHA-256: f6d54aabdd6a59fd740c459f7d4fab289fbd5cd6b7bce726efbd99ee78ae2f63
font_01_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 10476 bytes
SHA-256: 26b6d579a71dcc0ab0b7d5d9152e9665d7279e742d0baa7606dbc30203991781

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