Malicious PDF — malware analysis report

Static analysis result for SHA-256 f591eec8da241629…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 03:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76a991f694d9896f9eaa5ed73f2e9904 SHA-1: 76003f6bc4d78dcf12944ee6a6463c01e558a144 SHA-256: f591eec8da24162926623119d5ce829594eb1d5cfdd3576c17d32892242552e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure and embedded URLs suggest it is used as a lure to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=e+book+pdf+download PDF link annotation
    • http://smartvoicecom.com/userfiles/19520877682.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613125454f02e---japuxarokujemorunusedov.pdfIn PDF document text
    • https://servauto.fr/img/user/file/16457475131.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/21006138813.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/batijatelivapuxidapuj.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/46885690429.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/81656596083.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/52733161242.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/4888781165.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/roveb.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/mimog.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/zalixilusijali.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/karimuwifixetawemeder.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/bugonejojumazapunizuwu.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64971354745.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/nitem.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/wugavezegarisonupaxo.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/vafive.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16309634013031.pdfIn PDF document text
    • http://armanetti.com/images/tomamijuvivulobo.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210914120253.pdfIn PDF document text
    • https://blogsma.com/files/ginoxularezomilotaladi.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/fofatawumek.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc778a575d---17848662248.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_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 17368 bytes
SHA-256: 9af5527a192fe0eed9382b9dcb808a7eb50080c3da81f17ed877973ba7e9781b
font_01_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 10200 bytes
SHA-256: f025366b93220be44fcf3e2f30d4bbc14cf196bb36804eee5e6a1c1e8aa76d20
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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