Malicious PDF — malware analysis report

Static analysis result for SHA-256 660d4999f09b9465…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 15:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28b82164828656c2559cf7b4991ee925 SHA-1: 15b027136745c9b06e660145295d65c4b7043fde SHA-256: 660d4999f09b94656d38c69809901a1822583d3daa26ddce8682e96b90bd25a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a heuristic identifying it as a link farm on disposable hosting. ClamAV detected it as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/54775336356.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9c3766f7---51204545706.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/pematumuf.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/gekiwofawosefuladomukadop.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/robefifiselaj.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/97675363719.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/21315691663.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/98862427918.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/43927235461.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/jugudavijiluxivaza.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/37738755914.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/dopobutifedudavibu.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/nivamobevezix.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lsqtu9v6b6ltqkibe09hu7lu14/8297596028.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/57926955218.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/11614970674.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/86006327290.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/85198990227.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/61500460968.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85297861232.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/22917686873.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/fomomi.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/zosevimojesixase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tubemate+for+iphonePDF 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_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 10612 bytes
SHA-256: 356c0fd2fa86a2da96a60f2c7753f6b913228fc9052781a4852bd512ab264632
font_02_sfnt_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 17396 bytes
SHA-256: 1d028f97851bf587d7e4465ed210fa8de9761732731e2be1ff082d83e7d3e736

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