Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fcfead7193f94ff…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 14:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: deb972754afa2f2050a2c7d32117b4b1 SHA-1: 1aa795c6099d75d77b6ad497b408e58df31d7bb6 SHA-256: 4fcfead7193f94ff70c1334703b48d20935d3229757cb6ad6acdc87d7524dce5
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic for a link farm on disposable hosting further supports a malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=ranking+all+fortnite+skins PDF link annotation
    • https://himarco.ir/basefile/himarcoir/files/sonudewejanuvofozijokix.pdfIn PDF document text
    • http://chieucoingason.vn/files/retixirusigajamuramovuzot.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/56865982938.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/46228580033.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/zixoxokixepubej.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/86558411640.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xajaze.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/zubededibuzala.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kivukovinikesera.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/39281108356.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efed77e700---52242422526.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/poxijasawejevozexufaxunar.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/77052974346.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/26501860173.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/fivolakas.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/73677571763.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/32246511114.pdfIn PDF document text
    • http://usmleworkout.com/files/file/53398678604.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/pixopazekipu.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/romukefemagu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631321607.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/67329552368.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_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 10524 bytes
SHA-256: 36326c1f4fe463d024fc25b685cc2c397d7f5ce6b4b1182cee924ce748682148
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 18304 bytes
SHA-256: 282199100cdc32d641c24021c893303f7847a977948bd0e22cf6d22608aaab50
font_02_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.