Malicious PDF — malware analysis report

Static analysis result for SHA-256 11325a0c81020ca7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 05:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af30850fadb1e2b402635b6810db0732 SHA-1: 9b5679312a0ee9b038ec389eaa4f40e83c34cf18 SHA-256: 11325a0c81020ca7eebfc4a50164452d2a72ee28a447019fbaee9decfe9524cf
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and embedded links suggest an attempt to redirect users to potentially malicious sites or engage in SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://top-caster.com/userfiles/file/60164586396.pdf In PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/dutipakevojojaxezevezun.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tunuzoxobupogijalef.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/53168196995.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/83431490390.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/mubotevibune.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/wawolosuri.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/kapamiguvajadar.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/xepadovanivabulisijag.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wejamirorepakew.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/33663832216.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/dadivasitisu.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/buvezini.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/vurefikira.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/97727219014.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/88771b0ecce22300e48fde8cf7a7bcdc/47768015163.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/rofewijapitazekuwerim.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/41925272784.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/94527799943.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/lofisapotukukuvarufotaj.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210918_091351.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/sejazibuniwemuretolofami.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/fonozivejigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wps+apk+wifi+hackPDF 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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 17004 bytes
SHA-256: c971e29dc881fa5a9fd1b30e174f0dbacb1547e0dcfa44f5f013da035621f864
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10148 bytes
SHA-256: 5e0a0354d38d043aa5ad67aef22aa4a25dddc2d5f81d95e09e176261401087f7

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