Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a88836062849b5…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 11:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 31ef0b8186c0a7f08ea847574329934f SHA-1: 330b6d4e7e557c4ee0952f538a3f3543b3779448 SHA-256: a9a88836062849b5aa1febe0c224f951756216c8ca5d39519da7ea8045b427ee
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=how+to+remove+ads+on+home+screen+android PDF link annotation
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/bigetuvoxebanojebawoloka.pdfIn PDF document text
    • http://lex.tj/img/file/81739596791.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387373ebfab---pelaropiwivowed.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/xusezivif.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/49356091020.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/2027449546.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/44952689246.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4122f3c6---15764058265.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/gimodipudogumipot.pdfIn PDF document text
    • http://guitarenko.fr/img/files/44519617226.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/93628785650.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/venoxaveg.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/bugujevatijunovi.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/tajifeforilerorilolekiwuw.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/mekesazikesabaxubuzuteb.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/66918048952.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/wajobutejijonabisuju.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/82837333197.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109102208553194.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/jekufefixazaridowep.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/natenolukaxar.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/tijatubivise.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/6224158305.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/sijesuletamo.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/vanujinimodomofaso.pdfIn PDF document text
    • http://nemochem.cn/upload/files/rivitaxewajibokumenokojas.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_off0000be25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 10732 bytes
SHA-256: 2929e057210f719f8eeb722737ad2d739e8369c935f5d655bc3c0cfd728376d1
font_02_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 16572 bytes
SHA-256: 5ff54e1a1e79e1f0b9ace0ab68a4be0a730b27426104d4187905fd0c4f8e9bd6

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