Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7dfccaf234edfd…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 12:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fb17b58e2a19b043f9999c7c1a50cd0 SHA-1: d947b2a3396cb5a4687e9faa97a7a7a148d59d02 SHA-256: 0b7dfccaf234edfd801062d17498cc47ab7d3370611b4732fbd1a2120681747f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a link farm on disposable hosting, with numerous links pointing to PDF files, suggests an attempt to distribute malware or phishing content. The document body is heavily obfuscated and does not provide clear textual content, reinforcing the malicious nature indicated by the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://vnndt.com/Images_upload/files/wajofidopu.pdf In PDF document text
    • http://orderkiwicafe.com/uploads/files/bezoliw.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f00dd5073---sididaxabenorokofesex.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/13519690627.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/77854622909.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109012135193641.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/4130619492.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/55853563044.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/deruwiti.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/11871159206.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/zirojikivufulifazebapare.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/dududuj.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/97791489483.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/kinaxuvu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fidonidi.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210909_70A6493E3FEB611E.pdfIn PDF document text
    • http://esistore.de/userfiles/file/visidamowapenujurobesolix.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/navuguse.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/kinofixifedakojesoze.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/20840003894.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/14922710096.pdfIn PDF document text
    • http://tradotel-riviera.com/file/60998174708.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/jejamawewukafajokikugeru.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/92501559810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=easy+scroll+apkPDF 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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 18732 bytes
SHA-256: 42c94ff0190dc1dedec90947b22742139eb0116137eaee9f0d9dfa2e218b714b
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10132 bytes
SHA-256: 2532b46ba9586d9e33de207ed0226f8dadf3b24b3906b19722409dff575f40e1
font_02_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1