Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58dbcc5a14bddde…

MALICIOUS

PDF

86.5 KB Created: 2021-09-21 22:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a76a64e5c466135b17a05cdd1c7c6b2 SHA-1: e143c2c8086cd8c53bc4536b6b193c314cfbeb4d SHA-256: c58dbcc5a14bddde68b7ef8d650757abc7a27f6aea603170ad9841679556a351
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=gra+przygodowa+na+androida PDF link annotation
    • http://hanleyresources.com/images/bofupewojigojinimu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6e1f1107332a3c6082d4437cf32e118d/90453073942.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/vedumabevunofijazideba.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/rebopepirevetikudiki.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/zurunigive.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/14617359740.pdfIn PDF document text
    • https://geloracinta.com/contents/files/pugenobutunux.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/72078438087.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/lowifivukoxax.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/38883801581.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614346d3ad32f---3291726046.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/pasatasiwo.pdfIn PDF document text
    • http://stylekd.ru/files/63655404410.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/13618143176.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/97463503831.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/51142453306.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/netafepis.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/baxetexinoxesiwepu.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/pumezesowogonelo.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/81823044495.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/lativa.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210912131635.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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 18184 bytes
SHA-256: 03215455f09dbe6aed1834b7cf41f9fb2f3971a9c345b48dc16c6b1aa3748024
font_01_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 10424 bytes
SHA-256: 28681884660104f5fa1c4750d9313edb8dc817c0b456cd62275d2bc5ed879610
font_02_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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