Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fd238f33ee8a03…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 11:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce12832c0b106841316c150a204611e3 SHA-1: 85ddeb25b0244a2afe0df07e9bfcfbb03ec1e193 SHA-256: b4fd238f33ee8a03f8d5ebfc2e808c5163c0b2b8981d1f6748d0a0e2ff7d9694
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are disguised as software downloads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign, likely involving a malicious JavaScript payload within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://cructi.ru/uplcv?utm_term=touchgrind+bmx+2+download+pc PDF link annotation
    • http://www.heksan.com.pl/file/57174385642.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/vukoli.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/53189071082.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/pimafigazefibosimuj.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/68410692205.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/nepibivij.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/40468606889.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/95489442304.pdfIn PDF document text
    • http://weingut-suppan.at/files/41324729357.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/32805459058.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/tifubenuwefidogigomufafi.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/41481447238.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/89995194461.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/ludomigese.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/manubakowizijesa.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/sekuvegamukagaxef.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/34523269459.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/xeditobuzadobumis.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/48732274789.pdfIn PDF document text
    • https://chilepools.com/contents/files/56107101916.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/88074361445.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc364aeaa---79205487154.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///ritafezojemiviwe.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/vifomizovosepudukijudovem.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/biloduvo.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_off0000b051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 15728 bytes
SHA-256: affe03d9f442cb2de4ef925f022a18bb7917526ff2b2875faa2ee380fc8dc4f4
font_02_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 11076 bytes
SHA-256: 86407d52394494408c887a625860ecb17e90bc19fafc9c3cf225ecfc43bbab93