Malicious PDF — malware analysis report

Static analysis result for SHA-256 3878009e2b37ddd5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 12:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11dce72b2384b5920dc9801ddba61251 SHA-1: 10560f58019598b3aa37d9f563a7aa7f06b577a6 SHA-256: 3878009e2b37ddd5a2dc0a17d4d1a666ab36e83fb25ef93afe6a2d2ee401eff6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme leveraging a network of disposable hosts. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=gun+mayhem+2+download+free+pc PDF link annotation
    • http://larben.cz/media/images/upload/file/355422309.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/gejidovuvobe.pdfIn PDF document text
    • https://laps.pl/userfiles/file/33793003298.pdfIn PDF document text
    • http://krzeptowski.pl/file/72437021864.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/5960437234.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/gesotogi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbc998469---lajozexukaruvukaketa.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/25264540258.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/011053501045.pdfIn PDF document text
    • https://bawauang.com/contents/files/xanemikinivekeli.pdfIn PDF document text
    • http://kahasat.cz/data/file/97257742843.pdfIn PDF document text
    • https://atavio.ru/files/file/66960934897.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/xejafebazazotur.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17a912606---82140197205.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/wafubemumiwemibuditeni.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/c1aa2b64d158767b4d95b34236f5fd03.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/zinonunaxuvamik.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/dibativogurik.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/jirivebojizajazovezu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/wukezorutupuguvisinud.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/78502011869.pdfIn PDF document text
    • http://caramelitos.sk/files/wuporevuxiser.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-8/20210908045753211208.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/99434474882.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muwitelifen.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/90816561741.pdfIn PDF document text
    • https://congchung7.com/upload/file/84243714036.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_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 10984 bytes
SHA-256: b551a68cb8d0fddede7206145c2daffaa31a0fb786e9fac3f94787f4df63474e
font_02_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 21216 bytes
SHA-256: b3e0339588479952d5f32e75deaf7ad74ca837fe70e6741ba01a2d74536a2f6a