Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dff7b9459bdb4d5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 03:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0324b8992862a2ec1b139a6f1d658265 SHA-1: 8c0132565120affff504db014aa1bf51f512a487 SHA-256: 5dff7b9459bdb4d5a48930c5c9850fdc04014549b73781421a1c3cc22eab1bdd
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. It contains numerous embedded URLs, many of which point to suspicious PDF files on disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/75737039786.pdf In PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/fupoxuz.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/wokedoxazizezam.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/sogovafavobuduromok.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/45788890533.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/26804575154.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109080910364867.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109071026198103.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/44781280175.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210908/file/16310885001252.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/8147859249.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec6825f97---64477551332.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/tumugadefixagobujid.pdfIn PDF document text
    • http://egitara.com/upfiles/files/modejuv.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/fowalifegilogif.pdfIn PDF document text
    • http://www.ezmoving.com/file/24459626018.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/xogipenelarixojubotu.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/5734058778.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/kefum.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/jinusibetosozavorumu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74153718155.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xuwubujaporoxisojuwal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=windows+7+bootable+file+downloadPDF 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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 10516 bytes
SHA-256: 29dc5161cb2b035a75d431c7e0ad4923236d7375c39de7a32d4e7de81e0d9e51
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 16404 bytes
SHA-256: 87ce755e9d6105f5e973bfedc43cc5e302f5209850e8affc2ca3cf809b235cde

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