Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ddde23deb661b2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 22:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d741cf41bf637443490ce21941590be SHA-1: da6c9f2191a5edb87d3705e8e1e8ee66c4cc4c51 SHA-256: 87ddde23deb661b28918cd3f90b7f119fbb63f9de31d3edb172ecbe91b6eb572
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.vinoplaza.nl/img/upload/files/losijixijoto.pdf In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e817cdbc5---besugibizamavujovebunop.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/2528967964.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/retemenefujixinuso.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/xuxurubewujitavowe.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/28679672256.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/luserovixobakipa.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210906023427_rvi95l.pdfIn PDF document text
    • http://labsshop.com/d/files/29939759308.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210915152734.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090416004775.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/29688570843.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/lebirazazo.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/94342030438.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/31607349590.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/robirap.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/96472177999.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/rasugarufixiwomebogo.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/lupafovuwovivisagefuwixob.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/mulilofupomaz.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/xonemaragezejag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=amber+heard+zack+snyder%27s+justice+leaguePDF link annotation
    • 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_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 19180 bytes
SHA-256: 91396918178cbdbde59378b5d8ffc04e234e285a20577359ddd408d68790255e
font_01_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 11348 bytes
SHA-256: 979dea4b4effc82120eb59983538de281262f02aaebacbf8a8d79712e70b44f2

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