Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c37151a318226b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 03:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0ddb9a560ed25bbd86aa2472e471b53e SHA-1: 6e69c38bd87b10e780d0313df9e020d59641ff24 SHA-256: a1c37151a318226bc0e668b2c7f8e3e9be306a060306fc0ebe30c45de3c8cc8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The presence of a link farm on disposable hosting suggests an attempt to distribute further malicious content, likely through a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/91lqc807qo7ehbduo9esjc57ht/vinutita.pdf In PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/48334081193.pdfPDF link annotation
    • https://xn--80aaijzh9b.xn--90ae/documents/file/movubokunotolonebos.pdfIn PDF document text
    • http://tfforming.ru/d/files/2235792645.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/62370993927.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/66527225980.pdfIn PDF document text
    • https://mollis.rs/files/92787065827.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/vunoz.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/68563891869.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/tagawurobixut.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/vegewuraraka.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210907094908946.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bilusazowefivul.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/lowemuf.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jadamewawigakesag.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zekuwepujuvegaxowedat.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109111359172031.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/tadel.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/17070277976.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/sofeve.pdfIn PDF document text
    • https://baglab.pl/galeria/file/depofezod.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/tonapezovorokomuporilun.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/96679181035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=blade+runner+2049+art+book+pdfPDF 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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 18388 bytes
SHA-256: ff0deb898af07a06338cf37a127bede45523ae81c1d2a77579ecad976e7e1434
font_01_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 11104 bytes
SHA-256: 93619f126643fc1833f9df4bf85f19bb935c55364372c7940c5626c779eb6d3d