Malicious PDF — malware analysis report

Static analysis result for SHA-256 57760b7b7ad973c7…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 22:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8d3260315f013a50b2a4f7fbb7d7d20 SHA-1: 73c13ba46ed3e55f7ee0d78330aff9f7f415d467 SHA-256: 57760b7b7ad973c79f0acf0760707feabd51286ac72eac91a6d74fd1aca4abd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=english+reading+comprehension+b1+pdf PDF link annotation
    • https://clumba-indoor.ru/files/files/kuzenegu.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/13582191572.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nesodavomakurobevewol.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/tiwupilisepelaraxaru.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/pevopaxuvi.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/zugaxidajelatifasafole.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461ca8abfb1---bukek.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wiwanogepep.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/80843432156.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/zafekapuzotizugariz.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/namosok.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905042722922.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161354607d968a---60732945526.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/21227331955.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/vanekisewob.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/lujosurudabosonagi.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/28761966147.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/20710597244.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/48757248421.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-16/20210916135321323419.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210918_161250.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109101208324900.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_off0000ad4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 11144 bytes
SHA-256: c3d01d7eff3b2f13ad723855650e401db0c746a68e361ecd902d8b0e07fd2a60
font_02_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 16420 bytes
SHA-256: 20b5f846587fe60ccf92fdbf6ea579742a0f4a6981384a424573edb310819681

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