Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0014f95e327205…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 03:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c28e88037b0d34449c74c8fdea5af09 SHA-1: 1a9004c2301a013b04767c86b87b012c1729e3b3 SHA-256: fe0014f95e3272054b6b41389b19b183cd87c5a54dc595c7eb24f887ed624de5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wastran.ru/uplcv?utm_term=can+refrigerator+be+transported+laying+down
    • http://mudrberanova.cz/userfiles/file/dumejedanadezudikofezi.pdf
    • http://lejuriste.ru/files/file/17368634171.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140da2d05011---lotevodurul.pdf
    • http://dywin.com/uploadfile/files/wuvorovi.pdf
    • https://congnghiepxd204.vn/upload/files/65682055975.pdf
    • https://chanty.dacola.com/upload/files/54459705769.pdf
    • http://tokyosushilohaus.com/uploads/files/tabenumiku.pdf
    • http://bpsstudio.hu/uploads/wijepuzifilinagora.pdf
    • http://solee56.com/ckfinder/userfiles/files/1410586083.pdf
    • https://smgbid.com/ckfinder_userfiles/files/xudipasifo.pdf
    • https://limberhurstgallery.com/imageuploads/file/fulupapikepumu.pdf
    • https://kipass.fr/userfiles/file/60000556598.pdf
    • http://pb-book.com/user_file/file/36793147286.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/duxesewesadinesitajane.pdf
    • http://doubles301.jp/files/ckeditor/files/98448161456.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/71329a8e926a968d3ea173da88484b6c/63690968817.pdf
    • https://renesens21.com/ressources/upload/files/7992889366.pdf
    • http://tienphat.vn/imagesflashupload/file/25337563448.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/nefuwirojatig.pdf
    • https://svetplus.com/userfiles/files/zabesonumew.pdf
    • http://spellenindex.nl/images/uploads/66199632203.pdf
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/gafifudizozukalinaxajome.pdf
    • http://myucmas.com/userfiles/file/70891053462.pdf
    • http://taispacedesign.com/upload/files/77511992641.pdf
    • http://rnralpha.cz/res/file/6170060189.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_off0000ca52.bin
b264f98f229355d4c096020300b20f8980b9599b3c51b1edf4b7d648526556e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 17520 bytes
font_01_sfnt_off0000f75c.bin
7982bc28386fb04f5a48e63034dcf0ee2f2fae3192e36a762ee10f674716a668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 11044 bytes
font_02_sfnt_off000110da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 16792 bytes

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