Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d644999eb3f4e0f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 06:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0233093f1e9f983e7df285ca3b6d806f SHA-1: 5aac68c1466c8e41fd3476485a5e6ccecc5c5a4b SHA-256: 6d644999eb3f4e0f2e25101011ed4f4bd4983d59e17b387729f3245983a0cafb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a probable phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=resident+evil+3+remake+2+player PDF link annotation
    • http://fsoa.cn/userfiles/file/zuvizebuwimowizuti.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/sozivotexogibe.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/mewazumuxev.pdfIn PDF document text
    • https://tekartltd.com/upload/files/wupedogoxisijawadigo.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/49131720417.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/34190788059.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/gosinetidusa.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109091434431718.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/65806225754.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147958318229---23906862486.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/498a86a78eeaecd8283b689361ef681b/55106180902.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/jemujatojor.pdfIn PDF document text
    • https://emenu.hu/editor_up/89709229852.pdfIn PDF document text
    • https://lecachet.fr/docs/files/fetonobe.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/losewibuloni.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/71536977790.pdfIn PDF document text
    • https://estoniapools.com/contents/files/gofodorevewuz.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/67731733395.pdfIn PDF document text
    • http://smogy.ru/files/files/pagumedajasenoge.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/63202032846.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/vibil.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/7110824362.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/52407538240.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/nobewonurafeg.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/39641557462.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 17452 bytes
SHA-256: 252d80694e09603163163e990fdfef9a183aa1990bba8b8095a92f7af4629be5
font_02_sfnt_off00012d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D54 11040 bytes
SHA-256: 5eddfa4c24e45c86a983c2e08f05db924fb78cfa687e971f4eb421bf010de91a

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