Malicious PDF — malware analysis report

Static analysis result for SHA-256 df36c646fa2da7a5…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 02:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c207aade1a62c1a73200218a347f22e4 SHA-1: 7a2b609559e715b284c03dcbd0ebf60f037cff43 SHA-256: df36c646fa2da7a5b27e2963fc16ea799ee78ca305189e43a441c63d94cdbc2a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and remote-support lure. It contains numerous external URIs and embedded links, suggesting an attempt to redirect the user to malicious sites or download further payloads. The document body is heavily obfuscated, but the presence of remote-support lures indicates a likely intent to trick the user into granting remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://philabc.ru/uplcv?utm_term=mario+games+flash+games PDF link annotation
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/28079545084.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///visunotujukarake.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/viminodolipubokasosenul.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/50817037747.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/fizanelirobod.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/fukuzejogizexo.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/bujozifagulebibubadazuzo.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091222161470554.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/16135185152.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/40192628006.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/mefulesolipogupolewarito.pdfIn PDF document text
    • https://pmms-online.com/assets/file/lurujifukilunotuvexaz.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/dodeguxofifamizaj.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/75407674473.pdfIn PDF document text
    • http://learningkey.org/userfiles/82364932842.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/losusuragawanuvex.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163155012533.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/97095627340.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/pofoxamuzovawutijekufufew.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/gulagemizefokurunuvo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/93f9f3e8073b6356145b20a1d2cd807e/bejokuzuboparalekerupubit.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/nipiluj.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/20252918134.pdfIn PDF document text
    • https://buzyhub.com/files/6615250124.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/61091419845.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_off0000b1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 14660 bytes
SHA-256: 9110ac3d22b600e1be1839e11272da2380aa4cab05b75e2512c3d48e66a3a2eb
font_01_sfnt_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 10452 bytes
SHA-256: 01d1fc54496908e1dbb0d9cf8f97e43fc637b4f43a4a916bd8f6b56d435ad72a