Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfe8b43ab4376a3…

MALICIOUS

PDF

87.7 KB Created: 2021-09-14 04:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6da378d825265437fd88a38458731d78 SHA-1: c33d8cc162a423dedb722398ff1f7954bfe4437d SHA-256: fbfe8b43ab4376a321b20e64c5e9f030b785fe5b2a0542191d1e802fd66843c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to direct users to multiple, potentially malicious, external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://maymaygiaydachidang.com/upload/files/tagegupitefefiminuf.pdf In PDF document text
    • http://euredit-editions.com/userfiles/file/boxokuzevoxekumavudipizev.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/87495247779.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/49219191156.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/79719058821.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289f16ba69---buzofiwunedazalowesib.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210905211431.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/67333997702.pdfIn PDF document text
    • https://funke.be/data/file/72453045739.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/951811871.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-4/20210904043752708653.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/sewebakozufuvazeke.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/janakezumujarawudoxo.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/vudoxapidiva.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/nurifobog.pdfIn PDF document text
    • https://pr-dienst.ch/file/romipepulode.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/65559831594.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lafelojonaweral.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/waguxetenigajimagu.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/391608_92205914803.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://thewellmanteam.com/userfiles/files/zisenorobet.pdfIn PDF document text
    • http://oodow.cn/upload/file/210913174947919081b6uf8ik5mtve.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/18326212991.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135494e3ed70---bewevegukuzagagevaveb.pdfIn PDF document text
    • https://goodline.by/userfiles/file/falojapama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=offline+game+like+cocPDF 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_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 17292 bytes
SHA-256: ab67bb853c304bfad47deddb809b3c5bce33a892d6c26416a6786d7b6f72abe0
font_01_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 10432 bytes
SHA-256: ae3d469003d1088ef6def6ad5deadfaa59d2fd25dac2f411400cfacc66a6188a
font_02_sfnt_off000138c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1