Malicious PDF — malware analysis report

Static analysis result for SHA-256 faebf4231668ce52…

MALICIOUS

PDF

75.3 KB Created: 2021-09-11 07:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb1582ac39851aa689c1ee2ad667c12d SHA-1: 333e81872d819245f5b3547067dc63672d96f422 SHA-256: faebf4231668ce52f928344247c84434ece6132911c0ed5ce1a4b3b79f7d11ed
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and is structured as a link farm on disposable hosting, indicating a probable phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and external links suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://coretry.ru/uplcv?utm_term=derringer+music+adelaide PDF link annotation
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/18429372638.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/16479102874.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/46480806703.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/potomik.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/54102359512.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/19657412501.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/97308347305.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/334790466.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021911546183750.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210904_213650.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/42143622078.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/32738993389.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/6203397411.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161372b805a760---63288805745.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/devilirizosugijejevinuri.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/nafixusepon.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/14294911243.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/nezukavazijifud.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/duwilexawajomo.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/50311055616.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/velomup.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134fd09698b6---boxifegobamulabi.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/93345245751.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/nibekekiwan.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/betumegifuwesir.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_off0000bfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB8 18180 bytes
SHA-256: 986b39ba275d25d93c7e19af380c4c643ccb6d74fa021f9e39521c679c14d282
font_01_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 10596 bytes
SHA-256: 994a26a33320588623ac4beffaa96deee76fceb2f840378ab487251fb56c323e
font_02_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1