Malicious PDF — malware analysis report

Static analysis result for SHA-256 573d6f61bf403fad…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 17:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0a283b23d15079776d22455584de6d24 SHA-1: 5e5e0378e74363eee7be285f22ce2ed400a3747c SHA-256: 573d6f61bf403fad97b02d9e95487c0cebb81a8c23d288b102da661ef033b30f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous external URIs, many of which point to PDF files hosted on potentially compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded JavaScript indicates an attempt to execute code, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/59502168432.pdf In PDF document text
    • https://triosms.com/userfiles/file/47526465470.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/28568293603.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xozilagerubevezetivex.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/87627844270.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/79226817212.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/xexat.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/semipo.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/78412534589.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/fuxavakinajutixunobotir.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vovewekobedelizedujunoz.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/22250033025.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fusezuxo.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/45579472496.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/60926669913.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/39789253633.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/49052383222.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/fogub.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/masusad.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/duvokiv.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/mubonukawawutiji.pdfIn PDF document text
    • https://linardi.ru/files/file/19733282009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=apk+qr+scannerPDF 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_off0000be6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6A 10232 bytes
SHA-256: d2f0d1ef4af801ea16bfe628ce60860b2fea356a0fbd4fbb952444f116637359
font_01_sfnt_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 21144 bytes
SHA-256: 2c843dd44d8d1e35db457e5e8a1f0ef7cc520cbc6bfc131f00628c37359a32d8
font_02_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.