Malicious PDF — malware analysis report

Static analysis result for SHA-256 185b3b12e67bf2bc…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 12:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47c51bb97e8a3654241f8e447d4d2b20 SHA-1: fec62647c4184595819476d3d76e4ff76d2b585e SHA-256: 185b3b12e67bf2bc6a5d944e98125a4e27be87182a9a7afbe7f503b43124bd6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to numerous PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smelawservice.com/file_media/file_image/file/46538549621.pdf In PDF document text
    • http://exoticland.bg/upload/files/files/zeratolapemarunetajurir.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/wonedujagupupikukarug.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/gozukigekikamadakipixubu.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/62335029474.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/14223843592.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gezojukiwagi.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/bonid.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/9742004826.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/64483235021.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/nagedigofunuxuvulot.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/25080593703.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/70110458657.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/25730112011.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161315f2943d03---pezumefemivaxire.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/2248520450.pdfIn PDF document text
    • http://dd-eng.com/files/files/bufen.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/xasavixabafutaxijo.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109130122503271.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/givux.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/51209870654.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/9912242680.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/rutosafuvadiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=meteorology+today+9th+edition+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_off0000ae46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE46 14828 bytes
SHA-256: ee329087d04fea415da79e3eca560aa87d55bca632113939ad02b0ad8f71bb25
font_01_sfnt_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 10884 bytes
SHA-256: c3a5eca7f326d49d16fbb1ad77be25f3a451b6570302d9fd085be81539b32bbf