Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15702d8a31914a6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 21:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f21aab40de489fd9b8fc0c45f36076bc SHA-1: 2d3570c3f3dccddd406c18a6150da25a09649b9c SHA-256: f15702d8a31914a6bc1454820a3413b0503849971fe200f9b79d13125e5a49d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and numerous external URLs suggest the primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=mahjong+instructions+pdf PDF link annotation
    • https://agrilaui.com/userfiles/file/jowonew.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/29691148462.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/wufepadorukavodiz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320b993dd33---zepoxejusegopanomosa.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907190847.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210911052332.pdfIn PDF document text
    • https://ksboutlet.com/file/files/posomivurulisijubix.pdfIn PDF document text
    • http://napiarsaigh.com/images/80779870440.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/dibemeki.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/gapogopazurufadisupi.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/vagixosawusujozewefunu.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109120004514866.pdfIn PDF document text
    • https://10fci.org/userfiles/file/97374354165.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/24741931864.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/12474491161.pdfIn PDF document text
    • https://defi128.com/userfiles/files/wotiz.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/79843986550.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/xenonuxu.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/49472234248.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/xebivoxej.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/datokelizewuzedaxok.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d62301168---17674594750.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/48806255643.pdfIn PDF document text
    • 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_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 10944 bytes
SHA-256: 8d804f53f999b1268536865940211556ecc43edaa120237b8fe8dc085bdbe2e8
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 16632 bytes
SHA-256: 3ab6d06852f3f192bac0c88174736e2bb250dd08f87d2b2eb01490c7f7f99102
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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