Malicious PDF — malware analysis report

Static analysis result for SHA-256 701753cfae395923…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 11:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b5a54732b0bff69f7319b9df6e8f76cb SHA-1: 1e6edd9527181b1ab3b0c08ef58e2caa2d5b892e SHA-256: 701753cfae39592360d466a7f2647f104d803d544c0c1a30c7197087eb0d6613
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 PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a distribution point for other malicious content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or SEO manipulation attack pattern.

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://servingltda.com/userfiles/file/nenimuj.pdf In PDF document text
    • https://ncsccalgary.com/userfiles/files/21722224188.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/34991517215.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/tubizumezaxuposexuji.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/rilow.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/96293942057.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///13628056090.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/fofutazetatemifoju.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/18660926169.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/34477796277.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/52741248987.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/rawodaxur.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/pekufufegimusafusejurup.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/33923966818.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/wulenufubovimasonom.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/18481173530.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/wojebitotulepezufuboteb.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4ea4342a48a2ee7d273267374e8f0068/ridutajid.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/liwivodigepalal.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/68662912682.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0cbe09ee1---94837685464.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109011449437517.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/9092481017.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/84634041567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wecash+apk+downloadPDF 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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 10492 bytes
SHA-256: ac64ce7e5dc3f86b04d0c5c35f1c9259d8a8e5eda65bc377cd235d5a608b81e9
font_02_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 17868 bytes
SHA-256: d042104432040cec2188af6a92ffd7d9d821e544cd4643cd4da644aabfe9aa8c