Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe0f079a353aa4d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-23 13:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d45ddd5bea6f84e48cdb8f3ad6e96bad SHA-1: 1c11098c784f2f9ea4200a9d2146984054ac8ca6 SHA-256: dbe0f079a353aa4d4bb0b764930ab793e7f7f71057d20629dfb534ebc317cf92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, including one pointing to `oniceh.ru`, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=barsaat+old+songs+mp3+download PDF link annotation
    • https://sharjahcements.com/images/bulk_images/files/dogijuxegoxavir.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/22497598736.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/berepubigudoxetumobelalar.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/54876902569.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/8721813964.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/961706534.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/15119724826.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/f71k5ellfqaiudpc6apep6unug/sojusabusa.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/towusowozidodi.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/50952823283.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/tisipek.pdfIn PDF document text
    • http://wdnederland.nl/file/fetosijomodunatilug.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/78749006329.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/mejixupapagekapuvutujiso.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/zupalevogebululiba.pdfIn PDF document text
    • https://mar3ol.com/Files/files/84786671046.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/66336255120.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/13348504047.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/781775759.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/66361790086.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/rulitojaden.pdfIn PDF document text
    • https://parc-hotel.info/file/gasepetubewavagi.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/rimujoxusuxalosutezo.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_off0000b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 15668 bytes
SHA-256: bda8d8fb71aa48b6eaf57cf4d4c2f2c2f80d9d21d9f8fabb968a1fbb613dde56
font_02_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 10824 bytes
SHA-256: 72a3dcc50ee32d744397121ca35c9e97cb101954b33838e24cc1eeabd0649090

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