Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be81ba3e804a5cd…

MALICIOUS

PDF

69.1 KB Created: 2021-09-16 15:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5cf25bee90735cdb3d2be08ad2a6524 SHA-1: e44c1294ea1969d47e8e870242b2af7a5c18bd76 SHA-256: 7be81ba3e804a5cd5dc86e8cdf4b1c5fe3623f03f270330548adae245b5fa6a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://synerhu.ru/uplcv?utm_term=my+cash+app+apk PDF link annotation
    • http://elektro-galerie-hamburg.de/userfiles/file/87298407716.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/71923084304.pdfIn PDF document text
    • http://www.moyekolodin.com/files/2060586242.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/mubijusisupatatikiwa.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/kijoxusul.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/62183511724.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/99372150860.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404f8543a60---33868827133.pdfIn PDF document text
    • http://letdentalab.com/img/files/seduxutipikami.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/66824785102.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/lufefa.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/90986165103.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/vezuvif.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/podulopipawagowire.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/sufabuzanivaka.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/13704129778.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6f82b09a---18555755184.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/65402335461.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/25407254104.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/kezax.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/dijirutarapoxapet.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/mebulala.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_off0000b0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D5 9980 bytes
SHA-256: f05d167ceea94e34424645d5f5129d987f1de8f7702214e8c7b83f5f01e88de2
font_01_sfnt_off0000c715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC715 15848 bytes
SHA-256: e1ed80e73ab26f17783211a06be7c818aeb33b65c3ec109706fb83d0d574350b
font_02_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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