Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae663d5116492109…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 16:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0e20283f3ad65f145e7d5701040232c SHA-1: ffe3eba5c3ae9c2184c6edac9e4c9b1ebfe0fb73 SHA-256: ae663d51164921098c8773fb74dd976e51ad17178f40544b6addce005e4d20aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=call+free+%26+free+call+apk PDF link annotation
    • http://jjkxmy.com/upload/files/202109131948539451.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4325b80c0e51873338b1299a69a0810e/vonawelikigafolofi.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/nofetizesuser.pdfIn PDF document text
    • https://regenerateacademy.com/file/3577019995.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/80142319936.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/saguloda.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/36054353905.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/tarevikurifemed.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/bajanuvusesu.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/66903338220.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/legovenujevulot.pdfIn PDF document text
    • http://devison-matras.com/upload/file/44072954409.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/xerejonasinuda.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/sulufugugulikef.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/82308995028.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/89015331626.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dirosuziguvepimo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614955e51e5ba---56097632305.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/masabalanekifizuk.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/zelalufaxuv.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/jasosalasof.pdfIn PDF document text
    • https://wsbtitan.com/images/file/vojife.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/xozebegujowe.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/73647642943.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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 17136 bytes
SHA-256: b4c5407f8bebae3080c0d26be08568a42c85274fce8b73a8c981dc00aacb30e8
font_01_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 9656 bytes
SHA-256: 4045bb270c0bb4f123ea261e2de4b2eab943cab9897a575b4df763d8f8000549