Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca3fcdc26dd0224…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 19:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc49d45b407418789446c0f46703ae5c SHA-1: 65c7700b8ad75279648d545b5515f8a1da9a8588 SHA-256: 4ca3fcdc26dd02249e6f695d7ce13077dbdaba49ab97e6ac1c985ed8d97ee016
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/xuxifesaregumipenuj.pdf In PDF document text
    • https://pontus-sd.eu/uploads/file/tifotabokusek.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce33262f2---zavuzujodapigaronujovev.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/96889833115.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/vutabopogevitosikikojagar.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/74686036587.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/01d482a281cf6ea43c817b38ece62baf.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/53719997639.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/duzekalarubi.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/pebululomo.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/lifazoz.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/fozuvelilepedaxemobitepeg.pdfIn PDF document text
    • http://traviet36.com/upload/files/zazelikivosudidorosezuzu.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/nalibenenowilisumo.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/koruru.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vulizukipazogirepu.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/77191997584.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/mifapomof.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134b09885cb2---sukevevedabudofal.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/96654923905.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/33065751257.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901024455.pdfIn PDF document text
    • http://mopron.ru/upload/files/87082073924.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/wagaze.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/45135334002.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109090310239222.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/vexavubixeririg.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/kusotakizawojobupiwafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+3d+surround+sound+app+for+androidPDF 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_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 17252 bytes
SHA-256: 899e4075bc59af931b40343fb7f4b54268af3cabc65b25640e8a34620e39d52b
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 10772 bytes
SHA-256: 4f99b02c10e7525c29f4c5595724761aca8e608fca64743a4db541e5396a20b2
font_02_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1