Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac896c09ba65b54…

MALICIOUS

PDF

89.0 KB Created: 2021-10-09 02:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a2277887c02c42333cc5e24eeb2b9d5e SHA-1: 9e78e40e6c07e180d37eff151e74b5fc01afab73 SHA-256: cac896c09ba65b543da32e198494bfd5153597e5b6894b89d71c58ada35404b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=low+chlorine+in+pool+safe+to+swim PDF link annotation
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/rumukovilewazobonefama.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/51089614451.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/gefudavogag.pdfIn PDF document text
    • https://designclarf.it/file/nudamukereniwimudale.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/jexufuwiw.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/luvajumonofimaji.pdfIn PDF document text
    • http://feminella.ro/upload/fck/75799479148.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/82194165858.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9dd524826---wokalimim.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109141458212407.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/sovokozulivisiwezewugapu.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/totiku.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/87520430250.pdfIn PDF document text
    • http://blgjad.com/upload/files/jaguvejotoxafenutitu.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/66009784701.pdfIn PDF document text
    • https://mimpidia.com/contents/files/nerigiwaninimosazepe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bcbd2a980---70637261588.pdfIn PDF document text
    • https://almavilag.hu/files/files/zowizoxebav.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/mafamaguxigaze.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/5470949475.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/mapiteragebegajinigurag.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/50602020108.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/88629614551.pdfIn PDF document text
    • http://a-pluset.com/userfiles/vaxokaba.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_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10788 bytes
SHA-256: e968f14b7d75bda9436345bfde84b13ff0e55d65ace0e15d946edb2c4c8e8277
font_01_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 20288 bytes
SHA-256: 0767a6c539d7949b0007eabf9713ca0652e75fe5d19e4d8dc60c9f95d56be406

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