Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6515808c6ce912…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 07:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 427cedfc3e07f20b9fa7efbf7c874282 SHA-1: abea1b57e2a0de2bc35c647cb8e4334e8c556dbb SHA-256: 2c6515808c6ce912f13eacff71e3003b98aaa9bd090858757264ead33c51c7a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which are associated with link farms and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=apps+for+android+auto+2020 PDF link annotation
    • http://jatyn.cn/upfiles/202109/file/1630808835.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/lufibi.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/kusivisovenugebu.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/finurugiboruxanugowovuji.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/61587061357.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/61648771001.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907164612473831.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/bekabas.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/26169475026.pdfIn PDF document text
    • http://pedraferro.com/files/files/mekevuwunutiraxoj.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/fepakavafonate.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/ponenavisupewezit.pdfIn PDF document text
    • http://interior-mark.com/ckfinder/userfiles/files/dakefivadozikemewosowowo.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogudafobiju.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/zeviz.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbcd8d8a7---wudutovivuronexijetepevem.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/51525226857.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/26102190477.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/89719493074.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/durabilokalaroz.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/wikixifejusikeriwos.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/latut.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_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 10636 bytes
SHA-256: 6c0b931c5357ec78f8a1e827bf5ecf396c6225f19a29240f4d1b03c97a5a028a
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 17816 bytes
SHA-256: 96d6a4434bcc825497374ea65fb6fa480a6535d268aff6caff07295f32bb6154

Open this report in the interactive analyzer, or submit your own file for analysis.