Malicious PDF — malware analysis report

Static analysis result for SHA-256 54578840ab4dd7df…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 11:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5273fc0be98360ad1493648d3fa14d08 SHA-1: 573610a8424f2a9787fcc196fdce6e61500031ae SHA-256: 54578840ab4dd7df10294bbaac94027e1734e9c80611f1e56460ca2f8a2855ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to download a PDF disguised as a Windows 7 ISO. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent to deceive users into downloading a potentially harmful file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16137ad01d9799---72445622225.pdf
    • https://genegurumiraclehealer.com/userfiles/file/38855317176.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a51cb237b6bb26750a7d33400e9ebbdb/livenerusil.pdf
    • http://al-bandak.com/userfiles/file/vopejimorabixevopivo.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/sawafegutifumagixowar.pdf
    • http://gamecoast.by/uploads/files/81203613428.pdf
    • http://squash-fitness.cz/userfiles/file/41671185519.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebujobemematidewanetoxe.pdf
    • http://flapboxes.com/userfiles/files/89916420573.pdf
    • https://bursakaynak.com/userfiles/file/64363947724.pdf
    • http://driver-jazda.pl/upload/file/47117968311.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/19540297434.pdf
    • https://collinite.pl/userfiles/file/99191427121.pdf
    • http://llux.vn/uploads/files/68101088050.pdf
    • http://computer-rudolstadt.de/upload/file/15307721765.pdf
    • http://ilturismoinitalia.it/userfiles/files/99565268874.pdf
    • http://ristoranteibucanieri.it/userfiles/files/rigadodatisagojunuridover.pdf
    • https://mimpishio1bet.net/contents/files/6799521878.pdf
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/13708990601.pdf
    • http://gps-tw.com/CKEdit/upload/files/52075984703.pdf
    • http://supermarketdv.ru/files/file/nemut.pdf
    • https://n-tlg.com/files/file/fesujuxepaxu.pdf
    • http://sushiosushi.com/uploads/files/vudojinagoxigapefonele.pdf
    • http://autosoftware.company/autoresponders_images/files/9550771007.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=windows+7+iso+file+download+64+bit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d68d.bin
9f3ca79990f306ddb40c55028a16fcb5ab403171ddc73ffcfe896292299b888d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 16308 bytes
font_01_sfnt_off000100a9.bin
b5fb4f02eb462556e4fdbf2964c49a799a6ae00e5e91854255eaa56d017b7f79
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10764 bytes
font_02_sfnt_off000119bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 16792 bytes