Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdb025dca3cf51d…

MALICIOUS

PDF

75.7 KB Created: 2021-10-12 11:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d6e9361952046a3ced6ea3ec3c08f95 SHA-1: 719515a2b3ce2e6c784700d96b2ab09cccd34694 SHA-256: ccdb025dca3cf51d3c11f53b18a41ba18f25b394bda2b4c3f00acee097dddc80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document. The ML classifier and ClamAV detection further confirm its malicious nature, likely intended to redirect users to malicious content or facilitate SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://anhuizpyy.com/upload_fck/file/2021-10-7/20211007025439913586.pdf In PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/dipubuwuwuw.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/bavizepofugu.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/givixebutatuwivivutikilig.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/puwegujokis.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/35027899379.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/fimelofidiferajuw.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/wejawitowi.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/56161045271.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20211001025656_ilbt9c.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/74702500792.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/60597265266.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/71326473296.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/56756272147.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sijusu.pdfIn PDF document text
    • http://superazs.ru/images/news/file/50156755929.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/kejafalilixixuwoto.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/rokasusebazutigopakiz.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/wexunug.pdfIn PDF document text
    • http://chikatere.com/Upload/files/56987635563.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/besezazarebibapofo.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/gifikipetexu.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109060835374588.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=nick+and+gsPDF 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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 10116 bytes
SHA-256: abd11fa35f9e1ad3ee152f1dc11ef8ffda1961f1eb18fe50af3049ad53da5456
font_01_sfnt_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 18732 bytes
SHA-256: 0be6313db68061e00158e0ef8351c253b00b305780a726cf2001808b31cb301b

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