Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc38ba8a03f14294…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 13:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87e811d438ace95b60d7fa6b03d88743 SHA-1: c3e42aa427b102645a6f827fdee7b0668b76a3ff SHA-256: cc38ba8a03f14294a3dd3799f863c12c32e52ef8197158123e0711b4c16149a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=disable+proxy+chrome+android PDF link annotation
    • http://dharkaninternational.com/survey/userfiles/files/palodaxeziwara.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nedokekosakemilefozutubid.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/vexujunetubutiri.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/lojagefag.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/40177899156.pdfIn PDF document text
    • http://iknow.pl/files/file/79045852245.pdfIn PDF document text
    • http://innotack.com/userfiles/file/76885511389.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/xolezugorafejifeje.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/zikelenedipunita.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/zagebubawem.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/42889030693.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/99169033220.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/65919913247.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/pujafijajajedujasurorub.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090321264273499.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/demidirozumu.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/vasapubipakaminofomene.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/39435451789.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/23532794365.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/17320116566.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/729990891.pdfIn PDF document text
    • https://begili.com/uploads/image/files/94762325143.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354dbb04e28---xujigu.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/ravebaperinek.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_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 11036 bytes
SHA-256: 24aa75c8183c315147087d1c2ff8d07ac11c3f2bb528f7eb19b1ce372ffab17a
font_01_sfnt_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 15808 bytes
SHA-256: 333c20aff7c0488d2c11cf103e2479ca44b16589134c47951f25da5e84637fb1

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