Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f652ccdc5a6af72…

MALICIOUS

PDF

79.0 KB Created: 2021-09-15 09:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3189a5bf4103ed4ac017bcb4b6fbb88b SHA-1: 4e8fc817d3bd620339b60378ae8b34766649a227 SHA-256: 5f652ccdc5a6af729deba0dedcdb8704fac6478758f6b22749190235fa7e8a98
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious PDF files on unknown domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://allamericannursing.com/userfiles/file/59435196588.pdf In PDF document text
    • https://chung-pei.com/userfiles/file/sabez.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/xuzatozelazizalozifevija.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/putigasetetuxogideba.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/35952918859.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/2235806464.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090508150680554.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/16058509797.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/damikitanogoxododo.pdfIn PDF document text
    • https://hobbypet.cz/files/file/69322487.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/rezefuwewamabogo.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zivozesalef.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/udobug4jvbl936j26nm2iq9cgo/xalopavimorasivikariwi.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109132100477869.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195187307593.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/sexebomudusulanikuzokam.pdfIn PDF document text
    • https://sambelteri.com/contents/files/nutovitodadudip.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141867aea258---160992593.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/23283050909.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/rexelepabope.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/dijuduf.pdfIn PDF document text
    • https://agrando.cz/files/file/72332278022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+cell+phone+flashlight+appPDF 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_off0000d05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 17392 bytes
SHA-256: 42e2b561c03787181683692447ecae5eb3ae7b56c62bebdbf2ce1106b9fd17f0
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 10880 bytes
SHA-256: a9ed71c1d65a6b73e6b480a6066b2e7d321cb472b4e3e184429ca8402c113fb6

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