Malicious PDF — malware analysis report

Static analysis result for SHA-256 7500bd04f4346d6d…

MALICIOUS

PDF

99.3 KB Created: 2021-09-19 04:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 240806c0d43f4b4d67b0a0a250c7e98e SHA-1: bbaa29ebbea9b74e0c53b7b099e98b575adc6983 SHA-256: 7500bd04f4346d6dc0a92cf9a2f82efb65cd979704fec2f615d78aa9f493d8f4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document attempts to trick the user into installing a malicious browser extension or update. While no scripts were extracted, the document's structure and embedded URLs point towards a social engineering attack designed to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://infrabud.eu/fckpliki/file/kanerowimafob.pdf In PDF document text
    • http://getsolarny.com/userfiles/file/96464747767.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/24893465116.pdfIn PDF document text
    • http://sro52.ru/uploads/files/49783959671.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/92285309170.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/48432789176.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/liriwujalokulasi.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/34246424709.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090915154573499.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/6966889865.pdfIn PDF document text
    • https://foulardfotografando.it/file/najaxux.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631830520875454068.pdfIn PDF document text
    • https://masukpt2.com/contents/files/kudunurutexilemunas.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/laliwiput.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1vmanqsun0fc03nu87er957pv7/56962013740.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/15363669395.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/5801121203.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210915_B092077EAE60238D.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/41026720882.pdfIn PDF document text
    • http://seto.cz/uploads/palafomakikewaza.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/471c19ffefe07e5d74947f94e359f475/29250795842.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/setobuvufu.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/20444963474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=code+for+10000+robuxPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 17620 bytes
SHA-256: c60f5aa9105210d23756ccf510a770d540008095c2affde3a1e4c4d781fbf4e6
font_01_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13673 18992 bytes
SHA-256: 88b07c7b63fcb8d021df7455a2b1a5738236ea2b04403bcd0fdf925988d5e566
font_03_sfnt_off00016828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16828 10224 bytes
SHA-256: 25a3743b98538411c922f99ae24484707a92b03f7d96c60bf38be662b52eff7d