Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bc0974ef4c97a7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 13:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bab7a2f8c3681d87f7b4f67703af8b38 SHA-1: a19ed975d1fd21981b197255415d501e98fed59c SHA-256: 69bc0974ef4c97a7466bc3962ce626ea5c4c82dd06f733fd978346257304a66c
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM, indicating a link farm designed to redirect users. Additionally, an embedded JavaScript stream was detected, suggesting potential malicious scripting. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=android+21+dbfz
    • http://mbjarrahi.com/UploadedFiles/New/file/xasonakip.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/49447986452.pdf
    • http://baby-daycare.com/uploads/files/202109042303518433.pdf
    • http://annabarons.com/files/files/97261826955.pdf
    • http://abwalabamaave.com/uploads/files/fiwejixawowabun.pdf
    • http://www.blueoak.fr/image/file/21196724998.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/popagadexore.pdf
    • http://brenno-tojestto.pl/userfiles/file/genuw.pdf
    • https://jooli.ru/ckfinder/userfiles/files/52205671500.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b096b0a10983c09cfa0bcec484f79758/zavoxopalinet.pdf
    • https://tenekedjieva.com/uploads/file/64086108904.pdf
    • http://varadimasszazs.hu/uploads/files/duzikodejisivumubapu.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/ridopibimuboxa.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/fesixebuxodozo.pdf
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/40877821241.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/75564245972.pdf
    • https://www.abrasco.org.br/ckfinder/userfiles/files/fopenurene.pdf
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/88669620085.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/491e7b5b206bbd8ccaeedafcdd1fd7b5/xeribejajofat.pdf
    • http://ryanoomen.nl/uploadimages/files/xazabejoduxaver.pdf
    • http://safetruck.gr/images/file/lepigako.pdf
    • https://clickbox.ro/images/file/xigovewezideribuves.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/zoliso.pdf
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/gozawewerobivajatanuze.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_off0000ebbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 16792 bytes
font_01_sfnt_off000103cf.bin
4cdd5591af3ea328a9c22434c05d089bbc9a27f7c4f3a2ef1b3784be4f4e87ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 17448 bytes
font_02_sfnt_off000130bd.bin
06436413c2412f734dafcf6aad5e578ea53b2d31c6e2ed2ffa41fd8c0872110d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130BD 10092 bytes

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