Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c125bcc394117ae…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 14:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2260a4fd99634fa026f2a43c41a0cb90 SHA-1: c41d720f3b577d32afd9bbe2fdd3a70cc63fae3a SHA-256: 4c125bcc394117ae23df0ee3b6e87763d32d9f22ec400fdc2b1d801c0ca7c446
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for delivering malicious payloads. The PDF also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, many of which are unknown or potentially disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ags-car.com/upload/files/93026715220.pdf In PDF document text
    • http://status-go.net/gfx/userfiles/files/gagesaxa.pdfIn PDF document text
    • http://shophouse.info/images/files/28778767767.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/94575940227.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xegofimugulumerejojupidan.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/20764176388.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f34263063b---faxokomisorok.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/89098259463.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/10400054058.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906004613978.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/paremuzivexidu.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/27568215877.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/13908262028.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/29874642242.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/65487153028.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161301b4d0d49b---liguxozo.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/latunisowokewubed.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/gajumaxetajazenuz.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/roxagagubugiminamosema.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/bilumi.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/88707830504.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/72613370595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+game+onet+windows+7+32+bitPDF 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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 11060 bytes
SHA-256: f801beaff19cab11e4a6bc69f2bc6e495c83443f07205418449ece456aa04b80
font_02_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 16992 bytes
SHA-256: ad095c62347065e34089b69e570874349ac0dc7e4f1b61a727e0352a0c996bf8

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