Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c3e6166b1e36bd…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 13:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ab944beda7fb6ce8ceee7151544e1b2 SHA-1: 4db01192aeef79e4ecba9d29b0f7443e190e80c9 SHA-256: 88c3e6166b1e36bdb3acd3638725131867d75bda37b68a07981105f9bfee47ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on disposable domains, with one URL specifically pointing to a potential download. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://inwebjor.ru/uplcv?utm_term=z+archive+apk+download PDF link annotation
    • http://casadiriposomarsala.it/userfiles/files/71787955991.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/65687523445.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/rilupuzozegatoxak.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/85988703427.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/bigubuzojilubedarar.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3e0ded8b653acd31c14d9e98c4d38e62/70297396508.pdfIn PDF document text
    • https://viettrungson.com/media/Files/rekixim.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/24411392182.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/91795740251.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/62263404025.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/71689402001.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/51527350687.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/kesumifavewiwekatarisim.pdfIn PDF document text
    • https://ms1oke.com/contents/files/pitovupiruridizamozeba.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/lelolojisolaxu.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/dabawegexejixon.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lojagelugaxaji.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/33168679078.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/datuwopewazonovi.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/97193446567.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161452959a0ded---34605225901.pdfIn PDF document text
    • http://slsnn.ru/content/files/93621608563.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091611501674.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE91 14848 bytes
SHA-256: fb0cee9181fdf9cfa007c02cb480b462075abc8e95aa1ba917f3526c3a280a6e
font_01_sfnt_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 10552 bytes
SHA-256: e82704abb3f68242ddd052f5c1195573df51622f846e3f19cfed2865a4e03543

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