Malicious PDF — malware analysis report

Static analysis result for SHA-256 51459714bfd9fcbf…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 00:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fa8be588c3ad8a43e21b1fe5b398e18 SHA-1: 4ea8a3899dcae5b4097dd656bdae9fdc9e45a145 SHA-256: 51459714bfd9fcbf4fd1d4de655a38f15ab959da09e0cbcc273a1ea2340f63ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=korean+drama+series+app PDF link annotation
    • http://fixafilm.se/userfiles/file/36214999777.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a5d3b4494a23ebe4835066eeb867ea6c/19412041578.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/15204200608.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/pebexevefevujexu.pdfIn PDF document text
    • http://shamayachts.com/upload/file/komef.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-9/20210909003704614042.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/94063586242.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/miwavijonidusebu.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/14802025894.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/61004341767.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/xumijuzeselolisoxamalob.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/76781550629.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/lovuvipesosamosuxizovet.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buwipu.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/bosizexadonuriporixudu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34eb09796---74486708449.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/mejirowudosa.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zeduzodura.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e058acf3---3652533180.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/nofax.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/71679974723.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/25120234021.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/2572748089.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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 10400 bytes
SHA-256: a2780e76afc88d7c8677551f11c3e57e1377764228486cc8b745d04999efcc9c
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 18028 bytes
SHA-256: db61837463e84103149801b3626605f4b1a5e382f912f2822554a066d2f6fb33
font_02_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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