Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e6335dc57d7857…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 23:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e4dff7176d31b91bf960a7df48a812e SHA-1: 882a87eadd434351db7c8172cea736973101fb3d SHA-256: 98e6335dc57d7857c0ffdc40e8181187a641b294fcda2ec3fdf35f1f2a487560
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection service. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the PDF as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=android+or+iphone+more+secure PDF link annotation
    • http://9275522-travel.com/userfiles/file/39200227849.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/78318543765.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/juliwugezudaxujegug.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/31909128658.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109120207428423.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/91406039939.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/10197594231.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/rupifadisojoj.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/97945002601.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109031149005196.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/niterevikododugejo.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/42539068746.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/lopumexijepisuwup.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n6oda3puo3m0obomg0ak4ne1i6/61482842038.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/nifumawudinigit.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zevog.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/ponejavadipogenumemaz.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0958086001631172757.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/sasakud.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134796fae77c---20064091298.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-08/images/files/pareb.pdfIn PDF document text
    • https://pindimana.in/uploads/file/sabuzarigasomine.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/sejavo.pdfIn PDF document text
    • http://4bx.pl/public/file/zaturoleda.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/nifekefuvuzukaj.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_off0000ca32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 17268 bytes
SHA-256: ed509b984e161f611568e281eda902a3fa0abcf4b042ce44c80f45ce81bb60b2
font_01_sfnt_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 10552 bytes
SHA-256: 20e833b61b2a40695f23fb685a81a6e1fb94dab14b4fde849869b7fe9a3cf969

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