Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea446d1a35b4b34…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 00:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 545bf994679e0da2c13d3493fb094478 SHA-1: ba2e5bb6c6db6cf71d08bdded9e02b9a776dd5a9 SHA-256: 4ea446d1a35b4b34f1fd224cd388c912b0f4c0c21da369850ce27e58c5ed6796
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links to external sites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a payload. The file's structure and numerous disposable links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=iptv+gse+apk PDF link annotation
    • http://seibyou-koujien.com/files/files/movosasoda.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/wopojiwewizasizug.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/rawifamomaduru.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb9d76ed0---poduvakoka.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/98375253961.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/21306427933.pdfIn PDF document text
    • http://mweb.cz/images/file/86204441161.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/fojefovuvatifizitup.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/40703139805.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/29346442745.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/domilimoriguxonipakajenom.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rizufotovuvexo.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/vowarolagukagazad.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/38170211101.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/migiwuxasugaka.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/214e6adacd544419c83192fead70a7d9/zodozafipezepu.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kakopolifilegomogo.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/80948227085.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/rufafiravobaxi.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/givaniki.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/68671436015.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/79003910182.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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 10072 bytes
SHA-256: 92dcddae6294d0fe3c1d89eb42c716df6aa1932ece45c514b3fc20023222d823
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 17644 bytes
SHA-256: 49abda6e93b82ef761d013c18a78d3604bbb2b3b7ed8b2f5f21c9d016702a703
font_02_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1