Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b331c478e0b974…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 21:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3dc549a1f59d810d2dfac06cfe11a4d7 SHA-1: 453a93cf230facafcd1d3479deea76283cba8cf2 SHA-256: 62b331c478e0b974e79eb1070a6a4e8563a75880cd4fbc6e905a8608ca9d4497
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.childofafrica.org/media/userfiles/file/91716106104.pdf In PDF document text
    • http://ibshop.gr/uploads/_uploads/files/12793134620.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/sijazajakovigize.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/butun.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/12511727453.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/44886380391.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/59299600096.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/71627191033.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/8976502823.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/wijazirugovusone.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/vulowakofakigaviki.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/57853152508.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/29934198607.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/sevigoris.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/jewogumojulamosunexew.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/78283905994.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210903_941E959969E46156.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/30130669258.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/fibutizorir.pdfIn PDF document text
    • https://conrays.ru/f/data/79164569376.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/pasoxaxopulij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+skins+realPDF 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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 17748 bytes
SHA-256: dd5a03b80f8c0d635f090ca2ff1aa08389ffa01347c9c17273495b77bfbc7a5f
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 9952 bytes
SHA-256: 2726c90fc6d410e728f9d376185bcbe77379a99193cc55ee7a762b7b9d985a9f