Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c0ed85b1e7a419…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 20:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cae60216b703e9c54b60ace7f34c792c SHA-1: 545c1a3e3664d46e8345937f6ad90dce680037e5 SHA-256: 65c0ed85b1e7a4195ed984ed26ef1734842fd0f4f24f87d6124e006099f1eec6
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. ClamAV and ML classifiers have identified this PDF as malicious, specifically as a phishing or trojan delivery mechanism. The presence of many external links suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=california+dmv+driver%27s+manual+2018 PDF link annotation
    • http://pamatudarbai.lt/ckfinder/userfiles/files/47520262019.pdfIn PDF document text
    • https://partnermind.cz/images/files/veborivonakusavagi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gipowawezufixegosolabo.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/11420373041.pdfIn PDF document text
    • https://jetaime-shop.com/files/fepurenut.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/gakexarilepasida.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/jqn9serslcigjt8p6n5gomfcco/58453694986.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/18667375535.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/bobuxeworira.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/pesidasefunalamizosoloso.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/febitip.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/46643172922.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/43067322893.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/weganaraduturexof.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/neluv.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/20331222067.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/83966312476.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/tumivimiwifoxog.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613491f566ae2---rifiwowapepogewivirewexa.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/79656408044.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/69651721376.pdfIn PDF document text
    • http://taociren.com/upload/file/210903172853915752jpueek9cme65.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/dijijanugumusipezeravob.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/91508010382.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_off0000c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 11148 bytes
SHA-256: c93796d9ea492231aedda93bf87625a25b648216a0e0fce5f20fca0c40980749
font_02_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 17616 bytes
SHA-256: e1ca14e9bc47fad5ecaf70887bc36832880dcbe3024932f7003b5de1ca54860a

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