Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3de9a8e1edf0ce2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 22:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49fc2e6ce8fc4cd12068cb50e83c0d4e SHA-1: 05e904ca3ac85978a9d714a03bfaff7fede471a1 SHA-256: a3de9a8e1edf0ce22ce3a8ce4d86c397b555a3d835e4cad1481619b3abcfda63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the PDF structure suggests it's acting as a link farm. The presence of external URIs and the link farm heuristic strongly suggest the PDF's purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=like+followers+apk PDF link annotation
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68c199176---patejalezaseworifenol.pdfIn PDF document text
    • https://ambalatender.com/upload/files/pezapifosemobaniwur.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/49883904097.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/58012057944.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/6152086147.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/sowifukunuxu.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/luruxodebagakuda.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/48319059774.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/sitebaxupajujiwasupavu.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/45161308511.pdfIn PDF document text
    • http://mobitransjogja.com/files/wapojupopojavosutupuxipe.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/minekonaso.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/74940124502.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/jizutevizejizixopogati.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/dekugomedatizivab.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/34879554350.pdfIn PDF document text
    • http://heureka-cz.eu/files/67618448959.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/j6v8nonsson7keapqh7n26hejj/16851679384.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vimewikosebudawil.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/73228400869.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/xamevamapuzudogev.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/55247262747.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/xesukavisilubeduvaro.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_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 10284 bytes
SHA-256: 24a632eae46ce0fd85ed2e652612b8c1b6c844cad42903ac99287853d40a1a3b
font_01_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 18552 bytes
SHA-256: 7d373c1bf28fb2cb8b57ca8ea3a0b1aaf7c6dd2dbd84b8ee87f65117e723a35f