Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbcfe1ce7200e37…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 12:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee96519485cd73b37a424b3db436bf41 SHA-1: 3184e7710162e5339daa2ef40c1ce2d6a2c1fb9d SHA-256: 8dbcfe1ce7200e37a2a81468181ffa26dacfdbc9f3b63b2dac32cd55482d11b6
66 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and one specifically uses a Google feedproxy URL with a search term suggesting a lure for 'excel formulas for civil engineering'. This indicates an attempt to direct users to a link farm, likely for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zamdq.com/filespath/files/20210903055427.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/kegexevikasokoviwuvazorus.pdf
    • http://moscowfashion.net/content/xuploadimages/file/naragepokusazuxudimelo.pdf
    • http://kasintorn.com/images/upload/files/tofew.pdf
    • http://cornucopiafrederick.com/uploads/files/sowonakojozuxomatelegu.pdf
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/merigu.pdf
    • http://astmasme.com/userData/board/file/pagowitarikoxowofilepuvi.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210910_BCB0F7ED7B092719.pdf
    • http://sahcarpets.com/userfiles/file/51979311487.pdf
    • https://mimpi1pusat.com/contents/files/foroxitivitag.pdf
    • http://studioesflores.pl/obrazy/file/gabovosegitet.pdf
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/68858953872.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/xanaxulutedenebidodi.pdf
    • https://art-gallery.mn/uploads/files/ximukakudexadoxutom.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/539575167.pdf
    • http://metalzilemboeventi.com/userfiles/files/tamemujewero.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qsq4k6j5ii2sf49mj2paq3s8k8/72104435608.pdf
    • http://papinchess.ru/userfiles/file/pazarofejevevuwilirutal.pdf
    • http://dreamsurgerycn.com/ckupload/files/rokarusoniwisuvixute.pdf
    • https://loppisidjupdalen.se/images/uploaded/file/57096530468.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=excel+formulas+for+civil+engineering+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ff.bin
a0da138373123574ab2276387b404bc2468f50d13c58bd4f9c2bfb9675b4d26b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 11116 bytes
font_01_sfnt_off0000eabf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 16792 bytes
font_02_sfnt_off000102d1.bin
83537a7cf75ea0cb15366236164db370dfeb1877ed0c9c2d0a3954644fc15f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 17556 bytes

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