Malicious PDF — malware analysis report

Static analysis result for SHA-256 613efbd487644544…

MALICIOUS

PDF

96.5 KB Created: 2021-09-20 19:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: beca57ce5732c4b67ed2dee84b463620 SHA-1: f2c9c9d7ff3b9de9f737d6813ca8fd5cef7f5886 SHA-256: 613efbd487644544fe837774879744ed64e53ce686e5878a9baef40178f799f0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm used to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it may leverage embedded JavaScript or other PDF-specific exploits to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://lineshare.net/upload/files/20210905235654.pdf In PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/23441492932.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/naxonuvezamomunabir.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/51381471445.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/dotiniwolezolakonawu.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93590192825.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/gigunikelota.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/74867245762.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/rodosugirafusug.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/32986620239.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/82246839954.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/wenevaxisevunamaz.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wekuposagufojorubifi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141902e0e369---49599888350.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/tukevopikopuxakazuparu.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/14015631462.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/posofotiz.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24930852618.pdfIn PDF document text
    • http://xsteelstock.com/d/files/nomiribujazivuwutagafasok.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/14859530729.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/26274155670.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/12854704110.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/kidowokelo.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/rudabugugitodikonekosoxej.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/2095771723.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/15201025418.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/fewaneripudufegep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=line+drawing+compositionPDF 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_off00011393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 10852 bytes
SHA-256: 279aef4cb11ccb2226b353898d0b1e9398f2844a147a99b92d35a46d63b93bf0
font_02_sfnt_off00014490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14490 18424 bytes
SHA-256: 4158efe8184cd84c7144fa5545302dd63c090dbc5f3d89ac8d4374c6c6ead18a