Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a431b4e19f1aec3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-23 01:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8905c8c688b93bf262b5698c76ea301d SHA-1: 65b453e9818b429b7ef29b68b7a975b705cb0721 SHA-256: 5a431b4e19f1aec3d2c98239aa1d84b2a514164e9a356b8514db069a1f5a0ae6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or malware through a deceptive network of sites. While no scripts were extracted, the structure and numerous external links indicate a phishing or potentially unwanted software distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://maasmartcity.com/userfiles/file/madoxaweri.pdf In PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5762827065.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/ratifexenegu.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/gazalusun.pdfIn PDF document text
    • http://darstin.com/userfiles/files/83600001209.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/72621790864.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/xodobebamin.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/tozovomirefon.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/nakudadodusubamewamafid.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/desusilewum.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/namigojefid.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/55268185546.pdfIn PDF document text
    • https://kristinanamaste.eu/files/motugesotanugixabemasaju.pdfIn PDF document text
    • http://sbairs.com/datas/files/jowim.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210902_160053.pdfIn PDF document text
    • http://gabortech.com/admin/file/napajipugofokexunoxuf.pdfIn PDF document text
    • http://netflor.pl/upload/File/14140876514.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/fibewetanazesigoj.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/wipuz.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/80746172026.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/kijudupebise.pdfIn PDF document text
    • https://shidoremicrosys.com/media/98878522635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+fruit+ninja+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_off0000c4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F9 10600 bytes
SHA-256: 8d66026c82c66719dee8a7063bbf45039374840d30d95c46297e8ef39fa6777f
font_01_sfnt_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 16904 bytes
SHA-256: aed5fcde8ec12845ffa828239fc7055b2d4200ed89f102ff45380db99679570d
font_02_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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