Malicious PDF — malware analysis report

Static analysis result for SHA-256 227c871348dc5ab1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-08 12:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e153fde6d2afa206b6590b1291628feb SHA-1: 4da965d987eaec20db9e0e3d508a0ae9a5aad691 SHA-256: 227c871348dc5ab18b26f1736ddad6399fedd10d5c3f8d3d5bd627767d6659a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or conduct phishing attacks by redirecting users through a network of disposable hosting. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=rome+stoops+to+conquer+pdf PDF link annotation
    • http://nawoo.net/userData/board/file/72631688509.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/vulokibarunokoxelorowo.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/69309918950.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/99786654612.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/4146649.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/12464217304.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/sidibebonume.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/27974061309.pdfIn PDF document text
    • http://quetthe.com/upload/files/37569269007.pdfIn PDF document text
    • https://noventa.cz/media/files/file/15437958309.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/sikokefurifo.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/98428364951.pdfIn PDF document text
    • https://redac.ch/upload/44430874667.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/24940425975.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/zomadukenukalimekez.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nemapobiragamaxafa.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/piwilow.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/tefov.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xomanibatumatuzajivexigax.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/vepuzulojuwi.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/87406220560.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4A 15012 bytes
SHA-256: e3f78b77be269b89aef45b1d46021fc3d3c9407e3b7b0235ef4eb8bb61714056
font_01_sfnt_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 10772 bytes
SHA-256: 0f883c937c2cf9e4486c5a8933b7e0e80632a2a7b578cb007260536fb23d4a08

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