Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedefe67b11ee746…

MALICIOUS

PDF

80.1 KB Created: 2021-10-04 21:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 796ce86e8403edf4941e0e91ac19c61c SHA-1: 471819ed92f5e564b92d33a0b21d631349196a4c SHA-256: fedefe67b11ee746c2a8c1b5251d3f2f3d29019c9069dbc702daec6db55d3f7a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are on disposable or low-reputation domains, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports malicious intent. No scripts were extracted, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=mounds+bars+with+3+ingredients PDF link annotation
    • https://nordavril.com/userfiles/file/60187996369.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-29/20210929123031753464.pdfIn PDF document text
    • http://fullx.net/files/fujujuvo.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/kovimomalejexa.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34987584666.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/42388462045.pdfIn PDF document text
    • http://noelex22.org/userfiles/file/powanedovirili.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/88283024315.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/tegafevupibod.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aef6d647a6---mexalasaxofiw.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/jabumupa.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/8491796081.pdfIn PDF document text
    • https://anapobolivia.org/userfiles/file/vokatekoxazisabosuderabe.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/90983602057.pdfIn PDF document text
    • http://xprchemical.com/upload/files/munezorofomuwozumezubo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/75211756285.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/76725632639.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/2465171718.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/rejipador.pdfIn PDF document text
    • http://imoroz.by/upload/file/zusudikovulafavevej.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/66374339970.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_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 10972 bytes
SHA-256: 86fedf6bcbbc5f7a8a73f97a03e5fc252b5b5614173d14b7d42d8e7f0df94015
font_01_sfnt_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 18248 bytes
SHA-256: 3064641928ad7fd4df79d0435128130faee795882f44507cfaaba57a708b3ae0

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