Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59accc288774516…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 14:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0f4a671b7aaa6a4f73cd78097358ad6 SHA-1: 4ade1514dca0db57687cc580a3d4887ca710e07b SHA-256: b59accc288774516b27f52f5f8eb9d6a4fce8d9c543795cc8329e793f8374635
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs suggest it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yourwebcenter.com/files/file/legunedikenuririzexupej.pdf In PDF document text
    • http://seamacros.com/upload/file/kuwalofo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140082c91a1b---namelabafakex.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/35036421927.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/repawodoralu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zidufiwexisonerivokuwej.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/luwowezixitijurupebewoxu.pdfIn PDF document text
    • http://fluorescent-training.com/file/levapeduxitevufugoxisaze.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/86822307235.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/fubilevewilububawowuduz.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2740999821.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/74583964139.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210916120324.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b363de8d8546c421ff1820b74dc77b54/bokenokutuka.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/18979808949.pdfIn PDF document text
    • http://hanauhrova.cz/files/memofoxutajosi.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wukivelitofunanoxeboj.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/tewuv.pdfIn PDF document text
    • http://gapp.fr/medias/files/lesexi.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/zevujoja.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/6988895315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fast+and+furious+9+0123moviesPDF link annotation
    • 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_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 11244 bytes
SHA-256: 6adf5f1cd02c35f0fc56b6c5eb2096db71b1fec374dd04c9bb628c60fa448c6e
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 17620 bytes
SHA-256: 53589a7f50bbe82aa548154909950f90e2a79204cad09249803f53634378631d

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