Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd210aa448d2290…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 20:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09fb77194088592955e680f6586bd5fb SHA-1: 7f02fca205711b2b40e8b425840e8c3d3c29f240 SHA-256: acd210aa448d2290a0df5fc20207555a186fc335d03d7bf5d1410a335caad0ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to exploit vulnerabilities or trick users into visiting malicious sites.

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://forssh.com/userfiles/file/kowugukitemujimidusokuf.pdf In PDF document text
    • https://isleo.com/i_photos/file/nufefekabexi.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/32004747581.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/ledupajemeledabedove.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109091159583714432aw3kpgpg8ot.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/gemuzivonukitiz.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/kixedosefojomav.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/83521962679.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b13321df99---75818324274.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/xofekonokoxidogig.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/rosemovefetegulezepofol.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/033adeea1b826c37fc4c62efc58c1212/lifisanalujoxemune.pdfIn PDF document text
    • http://builderall.info/userfiles/file/gewelix.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/parila.pdfIn PDF document text
    • http://medica-brno.com/files/59495596037.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/xasuveg.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090320030252.pdfIn PDF document text
    • http://jarosi.hu/files/file/paxomoselukixajiso.pdfIn PDF document text
    • http://gekon.net/userfiles/file/69251570335.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/pixaboxokugasemebeniv.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/vigan.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/vogololusit.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/mesetud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pottery+game+apk+downloadPDF 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_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 17720 bytes
SHA-256: b5427a90e8f86fd39c17e0ec3222a95cf7340b76f15187a280bf22ce5ac9a068
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10768 bytes
SHA-256: ff1be1193447b09375573147346038f4de28de282939b37b5e793762a65f3024
font_02_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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