Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67a28fc7d5f802a…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 07:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd6606631f2cc5c9dcf0631668090632 SHA-1: 7e0585a7a3652b8c61a45764a25753a4ca77074c SHA-256: d67a28fc7d5f802a41a84dfecae3311932bcfd0c2af07f826875aeb1c714ba82
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to a large collection of other PDF files, likely for SEO spam or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://www.iciparis.ru/ckfinder/userfiles/files/55976891932.pdf In PDF document text
    • http://pmrs.ps/userfiles/file/73631906201.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/28519726767.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/76238905016.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613557d861c5c---kofobidajimupibuja.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/joribaxegubuvajenun.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210905_07791F8E7CD41C2A.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/kezowezaligo.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/32834720742.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/webap.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/94171163317.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/48679676440.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/faguloxexiwujusexesal.pdfIn PDF document text
    • http://partnercable.hu/files/46097255095.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/ziwedadebi.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2897e2ad---60051297888.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/sabusurotomolixavot.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/4634922719.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/viteguginanopuwusoko.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/98638369350.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/39323180166.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/gemunonategedar.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/80268050008.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/vurivowopivudunuvodujogep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=truecaller+apk+premium+2021PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 10496 bytes
SHA-256: d3bb28e14b400d17a0847eeabbbf9bbf61a6cc59dab57682e6b71bf7d89ac3a3
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_02_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 18904 bytes
SHA-256: 7335bc2862d739e9dab1dba714d1450bf11cfbbdb1b4552614d9beb30fcc55ec

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