Malicious PDF — malware analysis report

Static analysis result for SHA-256 862af6382e9e0811…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 20:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 08c15aacbfc62b91ca67a2efeadc5089 SHA-1: eb65d1ebdb25dad0ad5e041c5c9ce464c8aef5ea SHA-256: 862af6382e9e08119d7033a4c3202dcb0ae103e380b1fe09000d8c09dfa5be0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bernardthevenet.fr/ckfinder/userfiles/files/bubavorizidafokikef.pdf In PDF document text
    • http://centrons.com/uploaded/file/1048362612614451e4e4939.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/52805487195.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/fewukuzawejofaken.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/doxupuvababivig.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210923205737.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/66999374567.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/tefaxurobo.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/74928762905.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/7279404948.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/5001766636.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/nomopiza.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109031023049835.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/2364732094.pdfIn PDF document text
    • https://renewone.de/files/rogaroxewalebogodas.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/tavatifozax.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/moloxerijarinetit.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/luvuzimumevoxapiwura.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/69154917980.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/23976643354.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/rozunopabijopamusikeli.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/vuronaziti.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/65319973511.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9e679550bd038ac17761f7e1d2f4d4ea/lawuzerexavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+put+a+live+wallpaper+on+your+home+screenPDF 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_off0000ae13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 15604 bytes
SHA-256: 0d02267e78a0506b8c142541d90667eb1c05a213d3d77b1dbb1de6631331f344
font_02_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 10996 bytes
SHA-256: 1620c3bbb3275d1acc39c08424aaf3217febb61dcde4363d14ee4cd740f1c08d