Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6d5f12d2738f02…

MALICIOUS

PDF

90.4 KB Created: 2021-09-17 22:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 302827bdbe618b8f41b734497239c954 SHA-1: b5f5ba5a714204e4422e56b76bdcc126d9f54b19 SHA-256: 1c6d5f12d2738f020126dd867b7aec951ae794b13c0d011721b24807958681ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this assessment, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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 https://smidgel.ru/uplcv?utm_term=flat+style+bar+indicators+apk
    • http://magicfood-cn.com/files/20210915162456.pdf
    • http://weorderfood.com/uploads/files/14254081069.pdf
    • http://polymer-optix.de/userfiles/file/42648907722.pdf
    • http://fruhmann-elektrotechnik.at/tofefedoboxitatepizipilut.pdf
    • http://backkwang.com/userData/board/file/46603446352.pdf
    • https://fsbulletsandbrass.com/userfiles/files/ferivosovosazaxo.pdf
    • https://pnvvr.ro/userfiles/file/nozodurikug.pdf
    • https://o-dance.com/upload/files/bafugebige.pdf
    • http://lahma.pl/_u/userfiles/file/xakesagomazamedutepubupuz.pdf
    • https://ph2020.org/FCKeditor/file/1982105830.pdf
    • http://123podkrovie.sk/editor_uploads/files/kolafukimibiwiwifavo.pdf
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/27142278861.pdf
    • http://evola.it/userfiles/files/sadepigasiv.pdf
    • http://technology-mp.it/userfiles/files/91195438795.pdf
    • http://naturalfurnish.com/userfiles/file/mesaxijumudekoxod.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/39010172621.pdf
    • http://kkagro.com/media/images/upload/file/7641557329.pdf
    • https://transmilenio.net/datamont/userfiles/file/82048539220.pdf
    • http://stroyvodservice.ru/upload/File/ketesofafi.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134070d8bf36---lawowubuwavisavadegurek.pdf
    • http://geometrarontani.it/userfiles/files/dizibex.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/gegebenamefiluzemimuvedo.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_off0000f415.bin
8ce3c7962dc0bf80b05b1fbd627238a87e4fa9f8c137ddaa9ab93259041f9d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10832 bytes
font_01_sfnt_off00010cfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 16792 bytes
font_02_sfnt_off00012510.bin
51cd38a820f9e15ec83f4c51fc531653d7a92c00dbeb798a4e85529d721f6291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 20616 bytes

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