Malicious PDF — malware analysis report

Static analysis result for SHA-256 1208864e83e7b828…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 06:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1802155893ca408e4578d4c656f77a5f SHA-1: fedb13e2b64b099535a2521c3fd497eaf0c7f142 SHA-256: 1208864e83e7b8280c3c59f0a04ecae41f8c2ae1133c32276f21f7418f54a863
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading unwanted software or visiting malicious sites. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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 http://goldmustang.ru/files/files/jikaburilupo.pdf In PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/gawotupabejer.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/mameneb.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/46178017937.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/8666196575.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/lebabetapeziwo.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/bowegisoxomaru.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/14443507228.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xulebomodinivolazan.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/remigugidaromeduw.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/12068416510.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/48189860561.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/wobilovisevevipojizojite.pdfIn PDF document text
    • http://ruresept.ru/files/file/68130609012.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109121914131877.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/rizezuburi.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/83768151845.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8dqettlbfb5vp8pg7hs4p4rsrr/saketamewotomaxapogiwok.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/virotavikilejipiwo.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/52868234398.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/ditopiravigekanobofol.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/9569085783.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/42364091333.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/63526463698.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/29571552717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=play+store+paid+app+free+download+apkPDF 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_off0000b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 15964 bytes
SHA-256: dd699f0bdf195b561a312b04e9f1ad0faa7148d145a9dea012998339e81af64b
font_01_sfnt_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 10784 bytes
SHA-256: 4dcc0a21b6185eb467df5b9a5e84eab0ebb2ced336ec3756e288c651297808a3
font_02_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1