Malicious PDF — malware analysis report

Static analysis result for SHA-256 aada61688d20076b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 15:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3267afddd22125e9cfc29f6d610e1971 SHA-1: 71046bf7b256c91fc510f9663088e553cee6c72c SHA-256: aada61688d20076bc0030c55d2826c5f94fbed1d6910b53293458e784b5fa0c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://tradingcall.in/ckfinder/userfiles/files/84225555240.pdf In PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/78464921980.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/5501304438.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/miwuxigezikuluderovut.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/telatukokewalaxapimas.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/runubukofifinikeja.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/11961249399.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/ximerovugodexuputixaxe.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161424fbf0260b---vetakekazekelufegitibeg.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/sokevafenakigab.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5bcf03f62f56e8578d5e3862211aab6f/wabejusome.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101749459890.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/74488233704.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/63199084877.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/92879960726.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/dujiwufebisopifofebev.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/69650240183.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210916073511685152e6eov1.pdfIn PDF document text
    • http://specimport.by/files/files/14346223271.pdfIn PDF document text
    • https://brs.jo/userfiles/files/91161686805.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/31479865059.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/71238598747.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/8031487930.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/budexa.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/nadiveropiwutikak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+set+live+background+on+iphonePDF 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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 11268 bytes
SHA-256: 64a1bcbb22ba9d7536d401d144a8fece0b1f50bdca9ba4da993e070ffaae8278
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 17492 bytes
SHA-256: b3e55c22396498c7aaa26b795c14adb756689cac44693e1c5a6c399406d38991