Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cc822dea5ecddc…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 00:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 36f4d963a65d4abbc9f228557d16d7c4 SHA-1: b217fcc70b3b595e64a84f056a0621fd6a4547ec SHA-256: 75cc822dea5ecddc3f3ca535210da7d4d6f2470e5cfe2d6c50df75f551afe2aa
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the nature of the PDF structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=pubg+lite+ka+new+version+update PDF link annotation
    • http://papianiarch.it/userfiles/files/83425855335.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/66343432900.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/87401001160.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/walamegubilesetaguma.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fb1236f086826dc849545cb0e146a8aa/zanodi.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/xotiparidikotiboni.pdfIn PDF document text
    • http://artdental.hu/editor_up/jitemekoburarezunano.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/79403447567.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/vanavaranole.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/fuzafatotemub.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/ziraloxejasakakezodatanek.pdfIn PDF document text
    • http://katela.net/userData/board/file/70651593231.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/pajajigisujuporizol.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/makebupepaniwidegibor.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/55241712666.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/kowira.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tijexibebetepenu.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/8160782455.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/mafawepaliladaxuzurefomif.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/satopunobumezizefosuzo.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/22752919560.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_052719.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/26809671109.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/jopozuxolam.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_off0000b2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AB 16568 bytes
SHA-256: 103e8984c16da96b25f22a712d2ed89d67533d77fd6addc711ed1166c9a5b8e4
font_01_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 11052 bytes
SHA-256: 7f20c1eabf81f773281cad7a5397104cbf37b986f051cf341d1fda97e583ed3f
font_02_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1