Malicious PDF — malware analysis report

Static analysis result for SHA-256 82658089a6ea5aca…

MALICIOUS

PDF

95.7 KB Created: 2021-09-09 07:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de400a53caa2f89ec501f39c6013ab22 SHA-1: b69fca3f1864043acfb0e985c4dfd18d321cfaa7 SHA-256: 82658089a6ea5aca6b29f4080782e9e0674ef4d6171a0fb3a8a82804cb390174
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating a payment redirection lure. The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the nature of the embedded URLs and the 'payment redirection' heuristic strongly suggest an intent to phish for financial information or redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://lubrifianti-auto.ro/files/file/jokazuzarudox.pdf In PDF document text
    • https://2winit.com/Files/files/balifogagod.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/kezanivuvinena.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/39406780.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/jolezizizutobedi.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/zulifudaferuse.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/nagulakixezexesa.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xafoponebameripidigapo.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/9289909199.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/38398361622.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/28536421084.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/18876438696.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3101193013.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/dabisosemi.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/mukifewowexoxonejodir.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/65847421967.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/68187427514.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/90694218932.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/fuwadonidasarazo.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/lofalarogeta.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631137491.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/kozurojenoravu.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/losajuvaduki.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/fazod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+clone+messages+from+one+phone+to+anotherPDF 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_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 10912 bytes
SHA-256: eba252771bfad05901e2864993538cc13dd4d374a5b22da89a65744ee5debec1
font_01_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 17936 bytes
SHA-256: 8b642a8c73370ef8fe904f21f7bc9f9799baa9ece9f2872f630743f296738a92
font_02_sfnt_off000158a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1