Malicious PDF — malware analysis report

Static analysis result for SHA-256 4994d83a7d5df3f4…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc26dfecf3f0ad6b9994b5061d84d27e SHA-1: 724fde7d54e84f878fafc001d5210938aafd1c78 SHA-256: 4994d83a7d5df3f4fd447a6163ba3f1c87bbbaa9a6a44eb9dde0f49dbd356287
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, indicating they are part of a scheme to distribute malicious files or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=download+media+box+hd+apk PDF link annotation
    • https://clubkdo.fr/img/pics/files/19150833366.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/88494935759.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/milamabukinu.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/piminakijok.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/wumudokuvitafevoban.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138381b5671e---nevixaxamefebamevusovuf.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/52180456368.pdfIn PDF document text
    • http://teraval.cz/res/file/zaforevikuraligotod.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/70894110917.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/sodesipugibenelevuragozu.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/21307229477.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/jejetatubenexitato.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/46cbe67891c9affa84420d3fc940af6d/92091901008.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/32828499542.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/78219539509.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wisukulojijubisi.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/99631581263.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/86095869196.pdfIn PDF document text
    • http://domuran.pl/files/file/81449666008.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_off0000aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 16404 bytes
SHA-256: f07834f7b182bf1d2d829bff1d52e97f035ccb5caaf41d103de4c9da1bb9afc4
font_02_sfnt_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 10712 bytes
SHA-256: a30b8a4e279cad23e2fb93012cee2109cd6d9b6ddaa63aa4fc976a0a83ab9f8d

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