Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e163dce1b8b3261…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 08:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65239d12517ff25e297f006187227e0f SHA-1: 1121b45d2a50a21318657f977e080d648bb5e26e SHA-256: 0e163dce1b8b3261e47851566407f51d720fc5522fa8fec39ba0f095668d86b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'SE_ENABLE_LURE' suggests the document also attempts to trick users into enabling macros or editing, a common tactic for malware droppers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://huntic.ru/uplcv?utm_term=digital+media+renderer+android PDF link annotation
    • https://sananselmo.com/wysiwygfiles/file/jofitagowoluvip.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/93693479151.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/18642215764.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/88356113851.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/29947692480.pdfIn PDF document text
    • https://kildevangen.dk/files/88126039490.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/15921569411.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/82717759452.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/mumuwanamadudegume.pdfIn PDF document text
    • http://keitbg.com/images/files/11971782282.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/fukaxupema.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/difekewodibolomoga.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210909_CEC47C8F9BB08BEC.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/22303812927.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/64311225147.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4454c0c0---linavebuz.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/zuboxajexorani.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc80f1fc0---56838453159.pdfIn PDF document text
    • https://mihalex.by/files/files/80469868452.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/45062270047.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/dakegikajopi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 21556 bytes
SHA-256: c9159108831c54408caad5b32b5a0ac6e8ec48bcad015ee28ec76cd1096819b7
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 10424 bytes
SHA-256: f0d8f8e9a05e7d20c99eed832a33381763d3fca6898588b2827618533a936cf8
font_03_sfnt_off00013346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13346 16632 bytes
SHA-256: 988e26bb6ef776ab738e65419ddf9004aeec5c30cb2b3632da57ed105dd1c4da