Malicious PDF — malware analysis report

Static analysis result for SHA-256 541d4b34781d645b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-24 08:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4ea65b082a0042d8b436404303f5316 SHA-1: b0ad790ffc04f96db56bc95513f23ee70ad67851 SHA-256: 541d4b34781d645baebbb703cab51214e631f45fd3294d13442e65a531405263
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing-related PDF. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true malicious intent through a large number of redirects and distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=how+to+check+charging+current+android PDF link annotation
    • http://favourtec.com/attachment/file/miwojez.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/kesuxiriforawowutubokiguk.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/bbbfa6.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/walulibufowavebifetobegi.pdfIn PDF document text
    • http://zatacorp.com/upload/files/dogegagejepogiwuliw.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/fatedemujiwapozutoxemipo.pdfIn PDF document text
    • https://rubfila.in/files/file/norifi.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/lezegudub.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/voramo.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/bevunolegevo.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/59204542754.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/35830567129.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/47283578824.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/kotukovew.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210921_052709.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/62607105713.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6428d5c83814a87ecb3899606b981d7e/tazexi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a904cc116c6f19a11941006c216e094b/84841270343.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/8691229287.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/takavenojelex.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/pekivimonenevizapad.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/54264569352.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/zugamagipowusi.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_off0000d488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 17628 bytes
SHA-256: 7ed82d9d74bfce2620335ee99e65a660dc003a2100f5abb33ef1e080d15bc5af
font_01_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 10704 bytes
SHA-256: 9c11c438d825a845c3147d53c8e35335b8e76108ae573150a60a49f9736e2768