Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80fbb9ef4e3c05e…

MALICIOUS

PDF

93.4 KB Created: 2021-09-17 05:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de776d16045854ecbf4da48b7651f4bf SHA-1: bcbc3590e3f6be93ce5a788d254e0058f5be07da SHA-256: d80fbb9ef4e3c05e872e1acabbd5aa962a2d586c980f891bd11cf16a9530aac9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hepiran.com/cache/fck_files/file/gedefaxuj.pdf In PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/26060633015.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/moxosijobopef.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/worijevezobidebipe.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/siwezubanusip.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/batigurodaxide.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/lepirufubufovodinegeraku.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/6526910302.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/10951028518.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/vatineluxebaxuvawasabadi.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/34585243962.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/pemagaparo.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/3260897310.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/37742059997.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/26202568636.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/75649216818.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/23165617497.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/bibewuketovefazekirerasuw.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/sdn8rkg5qhlegd1tl8eecohmni/38734016665.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142f60291a77---24059060799.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/46437214559.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/76955602064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dark+heresy+enemies+without+pdfPDF 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_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 19280 bytes
SHA-256: 3197ad83c3e5eb536c89bee481b913e8310b32bcae1a7baa9974e031c42b08a2
font_01_sfnt_off00013647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5E 11112 bytes
SHA-256: 4addc1629374acc5458ba3f33e1ccc652b0cfadd3299b3eead67d62e6a3b30f2