Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b70f164013eaec…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 15:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ede99dba2925ddf8316cc84b3eb55ed SHA-1: 371888822bc10875bb5d553361c5962faa927782 SHA-256: c4b70f164013eaecfdc75294b378af9e79c690f0701e8c35a52c0ff2c9f7fe58
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or SEO poisoning attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, with a high number of distinct hosts and UTM parameters used for tracking.

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 http://rewitex.pl/userfiles/file/lanoxaf.pdf In PDF document text
    • http://veganogle.es/uploads/ckfinder/files/76714808966.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/24639178429.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/supewiruxutadufiki.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/50802271870.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/rurexigizapolerago.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/zakunezorufakalat.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/86994209116.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/28705888685.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/dawofalat.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/23724750535.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/23409450187.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/bomuxamavisef.pdfIn PDF document text
    • https://tmtteks.com/files/gekafedawasadosinibunaka.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/sitejawuramored.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/12289330446.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/gebogotowiwusazojom.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210908115759.pdfIn PDF document text
    • http://net-marketing.hu/images/files/rorasovurejijagewojizo.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/31027746628.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/zamef.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/18915069486.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f35ccdcc94698735de9a6672eae5ae33/66786730263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dream+league+2014+play+storePDF 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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 17876 bytes
SHA-256: 3590fd196180fd597489e7563d866ac53250daf4a4e83410a1301bc6be995329
font_01_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 10984 bytes
SHA-256: c7234d025cbd58e2cd095e7b7077c7dc4bf32f487da1f98a816415f0e8f465db
font_02_sfnt_off000128e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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