Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec4701cb85f1776…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 09:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4131d0d22ee3b9af736bea821dc36fd0 SHA-1: 54a838bd7de0e060a183818801909b5934e95fdc SHA-256: dec4701cb85f1776f146d44e926265651a50c9f801061e0f5c38b6d94cbac06d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially disposable domains. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161379398bce05---92378748070.pdf In PDF document text
    • https://makenie.com/upload/files/41325141910.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/62232470302.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/59789770334.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/kirugexamurawivijuzovoxo.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/jumetolujijofapub.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/visesasodufibunuxomuxi.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630961620704814794.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/rarub.pdfIn PDF document text
    • http://czyxchem.com/upload/files/nozabogiboxikotozik.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/68213964232.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/numibegirarum.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/13600914237.pdfIn PDF document text
    • http://goldmustang.ru/files/files/xosoneja.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/dewarelizefu.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/90133704830.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109020730455677.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f78c115b04b4924849845943f4bdc2a/61090836589.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/67122496448.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/luzitufipavofukigelijap.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/pukufamaxasej.pdfIn PDF document text
    • http://esistore.com/userfiles/file/mujuf.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/zavimilezizaguwiletovof.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/1991303155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=smash+brothers+n64+romPDF 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_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 17584 bytes
SHA-256: e70530267bc1f7daccf4f8d413efc7553d8fa0f42f0ca14af5f0208fd7c96524
font_02_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 10696 bytes
SHA-256: e84d327137bde3740280b6a50d446208057fe863452be2100e4387b11295159e