Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c50e471d5e4038…

MALICIOUS

PDF

76.1 KB Created: 2021-09-22 10:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c64ad6fa789420ce65861210e47b922 SHA-1: 876e38dece65dccf86fbb01df9e034ed172f811c SHA-256: 59c50e471d5e4038948d00631db6332ff79d4be811b9a506c4b53cd7c825c9e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=my+hero+academia+volume+21+pdf+free PDF link annotation
    • https://almoheetmanpower.com/public_html/userfiles/file/43427224723.pdfIn PDF document text
    • http://irths.com/upload_files/files/zobezixuzagokudawazu.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/97999169872.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/16740293422.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901111916_yi5gdo.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/74836850338.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-21/20210921182748418120.pdfIn PDF document text
    • https://schodyperfekt.pl/user_upload/file/peruvoxaduvod.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/zifilafaseredofafu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/megunizekarilixofaku.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/runaxovuwedidolarib.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/13763379426.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/luxofebopopora.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/51477493333.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/17213624385.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/41568539018.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/88336842597.pdfIn PDF document text
    • http://yoron.net/up/files/bovemubuwuxesisiloluvi.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/dubelezudakexupu.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/37019714762.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/97041308579.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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 10960 bytes
SHA-256: 25e4f968631592994923e487cc95e99b09e8983d2b53bd3f1047b3e565fc6693
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 18768 bytes
SHA-256: 2bd486c9729cfcb9a0c6acb13cc5d9eed73605001f33654813488bf38c41bc30
font_02_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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